In your opinion what book would provide a good overview of training theory in general?
Principles of Sport training by Dietrich Harre
Sports Training Principles by Frank W. Dick
Science of Sports Training by Thomas Kurz
Books by Vladimir Issurin or
Supertraining by Siff
Periodization by Bompa
I also have a book byCvetan Zheljaskov (Romania) that was demanded by my s/c course back at college (need to re-read it though) and there is a book on training theory by Bulgarian professor Platonov (Spanish Edition).
I can recommend to get them all though 