Tennis pro and author Scott Perlstein has created for purchase 18 downloadable tennis lesson videos. Books, hats and t-shirts are also available. tennispro.com
Monthly magazine published by the United States Professional Tennis Association for men and women tennis-teaching professionals. It features member articles and expert columns, tennis education, drills, sport science, and industry and member news. addvantageuspta.com
Ferris State University's Professional Tennis Management program was established in 1986 in conjunction with the United States Professional Tennis Association. www.ferris.edu/ptm
Doubles strategy and tactics for all levels, covering poaching, switching, partnership, match play, shotmaking, Australian Doubles, I-Formation, serving, and returning serve. www.operationdoubles.com
Former coach of Pat Cash and consultant to top british players. Founder of the Sport Biometrics System which specializes in injury prevention. www.bradlangevad.com