1. The Search for the Perfect Swing;Cochran,1968
2. 30 Exercises for Better Golf;Jobe,1986
3. The Natural Golf Swing;Knudson,1988
4. Malion W: Ask the doctor [semimonthly column]. Golf Digest 44(5):70.
5. PGA Teaching Manual. Palm Beach Gardens, FL, PGA of America, 1990, p. 14-21.