References
- Cooper , Kenneth . 1968 . Aerobics , New York : Bantam Books .
- Gough , Harrison G. and Heilbrun , Alfred B. 1965 . The adjective check list manual , Palo Alto : Consulting Psychologists Press .
- Willert , Roger F. 1948 . Motivation in relationship to conditioning exercise in adult life , Master's thesis State University of Iowa .