how to output the several reference in one number: 1 abcd... 2 abc... 3 ab...

Nowadays, More and more publications was produced and more and more references need be cited. Usually, author will classify them and then cite them as a group.

for example:

  1. (a) Becke, A. D. J. Chem. Phys. 1993, 98, 5648–5652; (b) Lee, C.; Yang, W.; Parr, R.  
    G. Phys. Rev. B 1988, 37, 785–789; (c) Stephens, P. J.; Devlin, F. J.; Chabalowski,  
    C. F.; Frisch, M. J. J. Phys. Chem. 1994, 98, 11623–11627.  
  2. (a) Oudar, J. L. J. Chem. Phys. 1977, 67, 446–457; (b) Oudar, J. L.; Chemla, D. S.  
    J. Chem. Phys. 1977, 66, 2664–2668.  
  3. (a) Stratmann, R. E.; Scuseria, G. E.; Frisch, M. J. J. Chem. Phys. 1998, 109,8218–  
    8224; (b) Bauernschmitt, R.; Ahlrichs, R. Chem. Phys. Lett. 1996, 256, 454–464;  
    (c) Casida, M. E.; Jamorski, C.; Casida, K. C.; Salahub, D. R. J. Chem. Phys. 1998,  
    108, 4439–4449.  
  4. (a) Cances, T. M.; Mennucci, B.; Tomasi, J. J. Chem. Phys. 1997, 107, 3032–  
    3041; (b) Barone, V.; Cossi, M.; Tomasi, J. J. Comput. Chem. 1998, 19, 404–417;  
    (c) Cossi, M.; Scalmani, G.; Rega, N.; Barone, V. J. Chem. Phys. 2002, 117,  

Can somebody tell me how to do it in Endnote X2?

Can you give an example of a publication with this style?  I am only familiar with grouping without the abc, which is a option in the output style settings under Citations, numbering, use one number for references always cited together. 

I am majoring in Organic Chemistry, and Tetrahedron is my favorite. It’s style is in this way.

Your solution is good when someone want to cite a group. Anyway, I appreciate you.

I find it a bit strange that the author instructions don’t define this in the instructions to authors, but that is the way that the papers (at least the one I opened in the free available issue) do it… The instructions (from  are:

References and notes: In the text, references should be indicated by superscript Arabic numerals which run consecutively through the paper and appear after any punctuation. Please ensure that all references are cited in the text and vice versa. The reference list should preferably contain only literature references, although other information (e.g., experimental details) can be placed in this section. Preferably, each reference should contain only one literature citation. Authors are expected to check the original source reference for accuracy. Journal titles should be abbreviated according to American Chemical Society guidelines (The ACS Style Guide; Dodd, J. S., Ed.; American Chemical Society: Washington DC, 1997). A list of currently accepted journal abbreviations may be found the journal home page at External Formatting for common references are shown below.

Scientific articles:

  1. Barton, D. H. R.; Yadav-Bhatnagar, N.; Finet, J.-P.; Khamsi, J.Tetrahedron Lett. 1987 , 28, 3111.

2. Doe, J. S.; Smith, J. In Medicinal Chemistry; Roe, P., Ed.; Pergamon: Oxford, 1990; Vol. 1, pp 301-383.

Patent/Chem. abstract:
3. Lyle, F. R. U.S. Patent 6,973,257, 1995; Chem. Abstr. 1995 , 123, 2870.

Meeting abstract:
4. Prasad, A.; Jackson, P. Abstracts of Papers, Part 2, 212th National Meeting of the American Chemical Society, Orlando, FL, Aug 25-29, 1996; American Chemical Society: Washington, DC, 1996; PMSE 189.


Hello tritiger, I have the same problem like u. Im using endnote 9 and i dont know how to put the references together like u want to do it. I heard from an old colleague that it would be possible, he did it, but he does not know anymore how. Do u already have the solution?

not yet.

I don’t think current Endnote can do this grouped reference. Why don’t you send it as “wish list” to Thomson. Of course, that won’t solve your problem immediately, but what else can we do…

I tried to construct a work around, but failed miserably.  Suggestion to Thomson via web and here in the forum Suggestions is the only way to go, as myosigi said.  sorry.

I found a solution which is fine for me: In endnote (i have version 9) go to edit>output styles>open style manager. Click on edit.  In “citations” >numbering u find an option: use one number for references always cited together. If u activate it, endnote will do exactly this. there is no a,b,c and so on but for me it is ok

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In my field of chemistry most of the leading journals (Journal or the American Chemical Society and all other ACS journals) use this alphabetical format: 1 a)  b)…etc.

I had an early version of Endnote and stopped using it becasue it couldn’t do this.  Then I hear that the newer versions can do this and I buy a new copy.

So am I to understand that EndNote STILL cannot handle this format style???  This is pretty sad.

As I said below, when I go to the journal instructions to author - they seem to say this is an optional style of referencing, and is there another package that offers this flexibility?  --but in anycase, heard a rumor that they are working on implimenting it… but I suggest you test the software before you buy it, to see if it has the functionality you need. 

Well, I have this problem with “abc grouped references,” too. And as a fresh user of Endnote I wanted this to work. So here is my solution:

Do it like it was mentioned in one of the previous posts about putting more references together and separating them with a “;”, for instance. Then edit your references in that group in such a way, that you write (a) (and (b) and (c) and so on) in front of the name of the first author of each reference (and maybe check the “full name” in the Style directory, regarding Bibliography and Author Name Initials - well, I haven’t tried it out without this, and, above all, I write in the references data “by foot” - just to be sure everything is alright). Then, when you cite, just cite the WHOLE group again and just next to the citation number (in your text) write the appropriate letter “by foot” (e.g., 1a, 1b etc.). I guess then you just have to be careful that you don’t mix up the letters in case you add more references to that group (and you would probably have to revise all of the cases when you used that group - yup, that is one of the drawbacks - but if you haven’t got a better way to do it…).   

I thought about this approach.  of course, it will be paper-specific unless you use that set of references as a group in all papers you write.  A related way to do this would be to leave these group semicolon-separated, then when you are finally done go in and manually put in the letter order.  You’d need to then add 4a, 15c, etc. in the spaces you wanted them- they wouldn’t be endnote-linked though.

I guess I will go back to single references until people figure out how to do this very common referencing format (regardless what the official, outdated, chemistry journal guidelines say)

I also have suffered with this issue, as it is required for Journal of Organic Chemistry and many other ACS journals (see ACS style guide or sample issue). After searching the blogs here and on facebook, I contacted Thomson and they said that this is a known issue and currently there is no way to get end note to do that. I have been working on a new style, I remember during grad school I got this to work in version 9, but no luck with X2 (mac). The best I can do it use the group all references option and the insert character before each reference option to get something that looks like this:

(1) Horowitz, G. Adv. Mater. 1998 , 10, 365. ($a) Newman, C. R.; Frisbie, C. D.; daSilvaFilho, D. A.;Bredas, J. L.; Ewbank, P. C.; Mann, K. R. Chem.Mater. 2004 , 16, 4436. ($a) Murphy, A. R.; Frechet,J. M. J. Chem. Rev. 2007 , 107, 1066. ($a) Dimitrakopoulos, C. D.; Malenfant, P. R. L. Adv. Mater. 2002 , 14, 99.

I will remove source codes when I am done and replace all of the “a$” with b, c, etc. I do notice that the first reference is missing a letter, if anyone knows how to fix that please advise. Also if anyone knows what characters endnote would view as a variable then it may be possible to make this work.

Maybe this request will have made it into X3 which this message says should be released soon?  Press Release on X3

As usual, Leanne is right! We are planning to include support for “Composite Citations” in the upcoming EndNote version X3. We got input from some of the editors of the American Chemical Society (ACS) journals to develop this feature. It is still worth noting that “Composite Citations” are not officially required for any leading journals (at least that our research uncovered). But they are commonly used in many ACS journals such as:

Accounts of Chemical Research
Analytical Chemistry
Chemical Reviews
Chemistry of Materials
Crystal Growth & Design
Inorganic Chemistry
Journal of the American Chemical Society
Journal of Chemical Information and Modeling
Journal of Combinatorial Chemistry
Journal of Medicinal Chemistry
Journal of Organic Chemistry

Jason Rollins, the EndNote team