Howard W. Sams has it all!
I don't know the availability because I have a 1980 edition, but there is a Howard Sams book on transformers.
"Practical Transformer Design Handbook" by Eric Lowdon
First Edition, First Printing - 1980
Howard W. Sams & Co., Inc.
It's a 240pg soft cover book, and is 8-1/2" X 11". It starts at "Elementary Electromagnetics" (Chapter 2) and covers through properties, construction, design, applications, examples, and practical issues like buying new or used, and Tests and Measurements (Chapter 16).
One drawback is that it only has a few pages on toroids. One quote from the book is:
...anyone who proposes to wind large numbers of turns onto a toroid is subjecting himself to cruel and unusual punishment.
It's an excellent reference and is recommended if you can find it.
Good Luck
Rodd Yamashita