It is easy to see formating options in Windows version. I seem to recall they are more “hidden” in the Mac version.
you only gave one example (of an e-journal) so not sure how other reference types are handled with regard to the quotes. I added them to the journal article fields and e-article fields of the attached revised version (which I actually started from Adv agronomy, as it looked closer to begin with). But that means it also doesn’t have a lot of the ref types specified. I added the e-article one.
However I found these Author Guidelines which aren’t vague at all (and don’t seem to be exactly what you showed either as articles in journals don’t have quotes?):
http://www.coventry.ac.uk/Documents/Lanchester%20Library/Guide%20to%20Referencing%20in%20Harvard%20Style%20Version%204.0%20September%202017.pdf
so futher edits may be needed.
CU-Harvard.ens (14.9 KB)