Check out the newest MRC bibliography on the films of the 60s and 70s:

http://www.lib.berkeley.edu/MRC/60scinemabib.html

...and while you're at it, you might also be interested in bibliographies on cinema's 60s and 70s "easy riders and raging bulls", including:  Martin Scorsese, Francis Ford Coppola, Brian De Palma, Steven Spielberg, Roger Corman and others...