Herrenkohl, R. C. (2007). Becoming a team achieving a goal Roy C.Herrenkohl. Thomson.
Lua i Stíl Chicago (17ú heag.)Herrenkohl, Roy C. Becoming a Team Achieving a Goal Roy C.Herrenkohl. Thomson, 2007.
Lua MLA (8ú heag.)Herrenkohl, Roy C. Becoming a Team Achieving a Goal Roy C.Herrenkohl. Thomson, 2007.
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