From YouTube - ADM3 Transformer Rewind Part3 by Jerry Walker on good books for transformer and inductor design:

There are many to choose from. I have quite a few but two I originally referred to most were:
TRANSFORMER
AND INDUCTOR DESIGN
HANDBOOK
Third Edition, Revised and Expanded
COLONEL WM. T. MCLYMAN


This covers the actual transformer design

And:

COIL WIND1NC
GEO. STEVENS MFG. CO .. INC.
Which covers the actual winding process.