Colfer, G. R. (1986). Contemporary physical education. W. M. C.Brown.
Lua i Stíl Chicago (17ú heag.)Colfer, George R. Contemporary Physical Education. Dubuque, Iowa: W. M. C.Brown, 1986.
Lua MLA (9ú heag.)Colfer, George R. Contemporary Physical Education. W. M. C.Brown, 1986.
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