What gunsmithing I do on a 1911 is based on Hallock's Book of the .45. It has good photos and drawings, plus understandable text.
Much of it is given over to Colt-specific info, such as proofmarks and years of manufacture for serial numbers.
It's around $11 or $12, at gunshows.
There are a couple of others; folks will chime in with their own recommendations...
Regards,
Art