Carr, Gerry (1997).  Mechanics of Sport. Human Kinetics. U.S.A. Ch. 7.

Griffin, L.,  Mitchell, S.,  Oslin, J.,  (1997). Teaching Sport Concepts and Skills: A Tactical Games Approach.
Human Kinetics. U.S.A.  Ch. 2, 3, & 10.

Hopper. (1998). Teaching games for understanding using progressive principles of play. CAHPER, 27(1), 1-5.

Hopper, T.  Physical Education 452 Class Notes.  University of Victoria. 2001

Dr. Tim Hopper's Web Page:  http://web.uvic.ca/~thopper/

Courtenay Spencer & Darryl McCrady's Web Page:  http://www.educ.uvic.ca/Faculty/thopper/tactic/index.htm

Soccer Graphics:  http://www.eteamz.com/makos/sponsors/

Soccer Net:  http://www.soccernet.com/home.html

MIT women's Soccer:  http://web.mit.edu/wsoccer/www/photo.html

NCC Soccer:  http://www.noctrl.edu/athlet/soccer_w/photos.shtml