This section provides further reading for the topics covered in Chapter 7, Version control.
The CVS website has a link to the CVS Information Page, which includes a FAQ, wiki, and manual.
Subversion's website has some information.
Perhaps the best source of information is a book by Ben Collins-Sussman, Brian W. Fitzpatrick, and C. Michael Pilato that is published by O'Reilly but can also be found online: Version Control with Subversion.