Mares, Gene, and Nicholson, Jerry,
"'VMFA-542 Forum' Capt Jerry Zimmer & Lt Al Graf Update posts by Jerry Nicholson on behalf of Gene Mares. http://www.vmfa542.com/vmfa542forum/viewtopic.php?f=38&t=30"
(2009).
Jerry A. Zimmer (Class of 1966) oral history and papers relating to the Vietnam War.
Brown Digital Repository. Brown University Library.
https://repository.library.brown.edu/studio/item/bdr:405058/