Johnsen, J. E. (1929). Interscholastic athletics. The H. W. Wilson Company.
Lua i Stíl Chicago (17ú heag.)Johnsen, Julia E. Interscholastic Athletics. New York: The H. W. Wilson Company, 1929.
Lua MLA (8ú heag.)Johnsen, Julia E. Interscholastic Athletics. The H. W. Wilson Company, 1929.
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