Bernd Jurgen Fischer "Albania at War" 1939-1945 is interesting book about Albania during WWII, probably the best book in English. Including theirs collaboration.
Antonio J. Munoz in his "East Came West" book also included a chapter about Albanian pro-German militias.
Some Albanian collaborators later emigrated to USA, like the Kosovar Xhaver Deva, a former interior minister of Albanian puppet government who served as US and American intelligence agent during Cold War.
Some of Serbian site have a few pics about Albanian collaborators and militias. Just try Carl K. Savich word, and you will find them in his writings. Or keyword like "Xhaver Deva", "Balli Kombetar", etc.