References
- Pietschmann R: Racquetball faster than tennis, and you can be a great player. Los Angeles Magazine 22:135, March 1977
- Kinchen DM: Rival to tennis. Los Angeles Times, June 19, 1977, part 4, p 1
- Vinger PF, Tolpin DW: Racket sports: an ocular hazard. JAMA 239:2575–2577, 1978