Não informado. (2004). Inspection report. Purdue University, Agricultural Experiment Station.
Lua i Stíl Chicago (17ú heag.)Não informado. Inspection Report. Lafayette, Ind: Purdue University, Agricultural Experiment Station, 2004.
Lua MLA (8ú heag.)Não informado. Inspection Report. Purdue University, Agricultural Experiment Station, 2004.
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