Clegg, R., & Thompson, W. A. (1974). Modern sports officiating: A practical guide (4th.ed.). Brown.
Lua i Stíl Chicago (17ú heag.)Clegg, Richard, agus William A. Thompson. Modern Sports Officiating: A Practical Guide. 4th.ed. Dubuque: Brown, 1974.
Lua MLA (9ú heag.)Clegg, Richard, agus William A. Thompson. Modern Sports Officiating: A Practical Guide. 4th.ed. Brown, 1974.
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