One of the best known source is "Fighters over Tunisia" by C. Shores but it is an old book and very hard to find. (and expensive too). The same is valid for the books about german fighter units by J.Prien.
Books from the Osprey series have info about various fighter and bomber units but these are too general since they often cover time intervals than the after-el Alamein air operations.
A nice book is "Fw 190 in North Africa" by A.Arty and M.Jessen
There are also many website of specific air units with lots of pictures and first-hand accounts. Some examples follow:
http://www.47thbombgroup.org/
http://320thbg.org/
http://www.325thfg.org/
http://raf-112-squadron.org/
http://www.3squadron.org.au/