^Frisbee, John, L. (1993-01-01). "Valor: Ace Among Aces". Air Force Magazine. Air Force Association. Archived from the original on 2018-06-16. Retrieved 2018-06-15. When James "Sully" Varnell's squadron moved to an area where enemy fighters abounded, he rapidly became one of USAAF's top aces.{{cite news}}: CS1 maint: multiple names: authors list (link)