I've just finished reading this book - Modulations: A history of electronic music; throbbing words on sound.
It's a collection of discussions on various genres of electronic music collated and edited by Peter Shapiro.
- Disco & Post Punk
Each section covers the genre in great detail and discusses the main players and some of the key releases.
One of the reviews on the back of the book pretty much sums the book up:
"A primer for the uninitiated and comprehensive history for the obsessive."