This is by no means an exhaustive list, but it should get you started. I would highly recommend the first two sites; lots of interesting information. Good luck!
Ps. Some of these are not exactly impartial sources; it seems that there is a growing backlash against circumcision these days. It should give you a place to start, though.
This one is a position statement from the American Academy of Pediatrics:
You wanted our personal opinions as well, correct? Well, mine is that I see little to no medical or hygienic reason to circumcise a male infant. If I were a mother, I don't feel that I personally would be able to subject them to such a thing. I don't see anything wrong with having an intact foreskin, and I feel that the risks involved in the procedure, as well as the amount of desensitization that takes place, are not worth the end result, which is simply a cleaner 'appearance'. My husband, however, when queried, disagreed with me. While he feels that he did lose a certain amount of sensitivity due to his circumcision, he felt that as a young male child, in the bathroom or locker room or whatnot, he would have been extremely uncomfortable when naturally comparing his own anatomy to that of his own father or other boys/men. In nursing school
, I got to witness four circumcisions in the newborn nursery, and left the procedure feelign pain for the babies who were subjected to it. Many doctors routinely forgo anesthesia, and the only circumcision that wasn't painful for me to watch, and seemed somewhat less painful for the baby, was one in which the doctor employed the use of an anesthetic cream called EMLA. Just some thoughts. Good luck with your paper!