as long as you didn't make them all up - the markers will no way know every single historian who has ever said anything about a particular subject. But they would be more impressed if you used the more well known ones, like Redford for any Egyptian topic, or Wilson and Gardiner and Bury for Greece etcetc.
Also, they don't mind if you either misquote, mix up your historians or para-phrase. i think its just the fact you tried to back up your argument.
hehehe, i was soo gonna use AP LEWIS (me, as a historian, friends made it up durin trials) but i didnt, coz i thought ppl from ere mite have used it, is been constantly debatd in the forumns, meh, maybe someone will use it next yr