Short version of the reference

Hi guys, 

for my thesis my university requires a reference style which contains 2 parts (photo in the attachment) which looks like this

Author (year)

Author: Title (Issue) blabla

I know i can twist some existing styles but the PROBLEM is:

the first row (author and year) is used as some kind of navigation for the reader. So if there are 3 or more authors, the Author in the first row should be “First Author Name et. al.” But the Author in the second row should show all the names of the authors, I could not find a solution for this…