Being a close-up photographer:-
Close-Up Photography & Photomacrography by Kodak
The Manual of Close-Up Photography by Lester Lefkowitz
Photomacrography, An Introduction by William White.
There are loads of general photography books and Web pages dealing with conventional photography, but not very many technical close-up photography books or Web pages. Most internet "macro" pages are about photo magazine, or superficial beginner macro articles level, usually written by conventional photography authors detailed to do one on macro.
DaveW