Leimkuhler, F. F. (2009). An Enduring quest: The story of Purdue industrial engineers. Purdue University Press.
Lua i Stíl Chicago (17ú heag.)Leimkuhler, Ferdinand F. An Enduring Quest: The Story of Purdue Industrial Engineers. West Lafayette, Indiana: Purdue University Press, 2009.
Lua MLA (9ú heag.)Leimkuhler, Ferdinand F. An Enduring Quest: The Story of Purdue Industrial Engineers. Purdue University Press, 2009.
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