Subtractive synthesis

Does anybody know a good book/source about subtractive synthesis, something with a practical and fun approach would be nice ! :)

http://www.soundonsound.com/sos/allsynthsecrets.htm

http://www.cim.mcgill.ca/~clark/nordmodularbook/nm_book_toc.html

It's very simplified but this guy has really helped me with with the basic concepts of additive, subtractive and FM synthesis through his Ableton tutorials -

(I ended up throwing about 40 quid at him for his two downloadable Ableton tutorial DVDs)

Thanx alot guise, much appreciated ! :)