Reddit mentions of The Shark Handbook: The Essential Guide for Understanding the Sharks of the World

It's an older book but one I am very partial to because it got me started: Great White Shark by Richard Ellis and John McCosker http://www.amazon.com/gp/aw/d/B00HQMZQ0E/ref=mp_s_a_1_2?qid=1458936067&sr=8-2&pi=SY200_QL40&keywords=great+white+shark+ellis&dpPl=1&dpID=51701uVuhcL&ref=plSrch

Another interesting read is The Lady and the Sharks by Eugenie Clark. http://www.amazon.com/gp/aw/s/ref=is_s_ss_i_0_19?k=the+lady+and+the+sharks&sprefix=the+lady+and+the+sh This was about setting up Cape Haze Laboratory (now Mote Marine Laboratory) which studies sharks primarily. She has a great writing style and the focus on the research is interesting. During this time Genie was running tests on lemon sharks which ultimately proved sharks were capable of being trained and learning to feed at particular targets. Her papers on this subject are fascinating too. Those are on Google scholar if you're interested or PM me if you need help.

Fora general field guide or handbook on sharks I'd go with Dr. Greg Skomal's guide: the shark handbook http://www.amazon.com/The-Shark-Handbook-Essential-Understanding/dp/1604330074
Most overall shark books tend to be geared more towards kids but Dr. Skomal does a great job not dumbing things down. The photos are great too.