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Gebhardt, Deborah L.; Crump, Carolyn E. (1990). "Employee fitness and wellness programs in the workplace". American Psychologist. 45 (2): 262–272. doi:10.1037/0003-066x.45.2.262. PMID2178506.
Myers, David C.; Gebhardt, Deborah L.; Crump, Carolyn E.; Fleishman, Edwin A. (1993-12-01). "The Dimensions of Human Physical Performance: Factor Analysis of Strength, Stamina, Flexibility, and Body Composition Measures". Human Performance. 6 (4): 309–344. doi:10.1207/s15327043hup0604_2. ISSN0895-9285.