I recommend the following to get you started. More technique and pistolcraft than mechanics, but there is some.
Practical Shooting: Beyond Fundamentals, Brian Enos
http://www.amazon.com/Practical-Shoo...9648679&sr=8-2
Refinement and Repetition, Steve Anderson
http://www.amazon.com/Refinement-Rep.../dp/1930847769
Surgical Speed Shooting: How To Achieve High-Speed Marksmanship In A Gunfight, Andy Stafford
http://www.amazon.com/Surgical-Speed...9648722&sr=1-1
T.A.P.S. Tactical Application of Practical Shooting: Recognize the void in your tactical training, Patrick McNamara
http://www.amazon.com/P-S-Tactical-A...=1CL07PD0KL43J
Tactical Pistol Shooting: Your Guide to Tactics & Techniques that Work, Eric Lawrence
http://www.amazon.com/Tactical-Pisto...9648953&sr=1-1
The Gun Digest Book of Combat Handgunnery, Massad Ayoob
http://www.amazon.com/Gun-Digest-Boo.../ref=pd_cp_b_1
The Gun Digest Book Of Concealed Carry, Massad Ayoob
http://www.amazon.com/Gun-Digest-Boo.../ref=pd_cp_b_2
Stressfire, Vol. 1 (Gunfighting for Police: Advanced Tactics and Techniques), Massad Ayoob
http://www.amazon.com/Stressfire-Vol...u-wl_list-recs