Griffin, L., Mitchell, S., Oslin, J., (1997). Teaching Sport Concepts and Skills: A Tactical Games Approach. Human Kinetics. U.S.A. Chapt. 3 and chapt. 10
Kirchner, G., Fishburne, G., (1998). Physical Education for Elementary School Children. The McGraw-Hill Companies. U.S.A.
Dr. Tim Hopper's Web Page: http://web.uvic.ca/~thopper/