Gwathmey, J. T. (1915). Tumbling for amateurs. American Sports Pub. Co.
Lua i Stíl Chicago (17ú heag.)Gwathmey, James Tayloe. Tumbling for Amateurs. New York: American Sports Pub. Co, 1915.
Lua MLA (8ú heag.)Gwathmey, James Tayloe. Tumbling for Amateurs. American Sports Pub. Co, 1915.
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