Birdman, J. (1998). The training of Penny Heyns of South Africa - Olympic gold medalist 100 and 200 meter breaststroke. The World Swimming Coaches Association Gold Medal Clinic Series, Volume 2, Fort Lauderdale: The World Swimming Coaches Association (Hrsg.), 1998. - S. 110- 121, Tab..
APA-Zitierstil (7. Ausg.)Birdman, J. (1998). The training of Penny Heyns of South Africa - Olympic gold medalist 100 and 200 meter breaststroke The World Swimming Coaches Association Gold Medal Clinic Series, Volume 2.
Chicago-Zitierstil (17. Ausg.)Birdman, J. "The Training of Penny Heyns of South Africa - Olympic Gold Medalist 100 and 200 Meter Breaststroke." The World Swimming Coaches Association Gold Medal Clinic Series, Volume 2 1998.
MLA-Zitierstil (9. Ausg.)Birdman, J. "The Training of Penny Heyns of South Africa - Olympic Gold Medalist 100 and 200 Meter Breaststroke." The World Swimming Coaches Association Gold Medal Clinic Series, Volume 2, 1998.