I've only read a few books on macro / close-up photography so I would mention them -
1. Understanding Closeup and Macro Photography by Bryan Peterson;
2. Close-up and Macro Photography by Adrian Davies;
3. Creative Close-ups by Harold Davis;
Cheers ... J.R.
1DX, 5D3, 600D, RX100
16-35L, 24-70L II, 70-200L II, 100-400L II, 50L, 85L II, 135L, 17TSE, 24TSE, 40, 100 macro, 18-55 II, 55-250 II, 1.4x III, 2x III, 600RT x 4
When it comes to gear, it is better to vote with your wallet. Bitching on online forums like a lunatic doesn't get you anywhere!