Gaastra, R. (1998). Coach of Fred Deburghgraeve Olympic Gold medalist 100 meter breastroke. The World Swimming Coaches Association Gold Medal Clinic Series, Volume 2, Fort Lauderdale: The World Swimming Coaches Association (Hrsg.), 1998. - S. 5-12..
APA-Zitierstil (7. Ausg.)Gaastra, R. (1998). Coach of Fred Deburghgraeve Olympic Gold medalist 100 meter breastroke The World Swimming Coaches Association Gold Medal Clinic Series, Volume 2.
Chicago-Zitierstil (17. Ausg.)Gaastra, R. "Coach of Fred Deburghgraeve Olympic Gold Medalist 100 Meter Breastroke." The World Swimming Coaches Association Gold Medal Clinic Series, Volume 2 1998.
MLA-Zitierstil (9. Ausg.)Gaastra, R. "Coach of Fred Deburghgraeve Olympic Gold Medalist 100 Meter Breastroke." The World Swimming Coaches Association Gold Medal Clinic Series, Volume 2, 1998.