Não informado. (2012). Purdue Agriculture Reports. Purdue University, Agricultural Experiment Station.
Lua i Stíl Chicago (17ú heag.)Não informado. Purdue Agriculture Reports. West Lafayette, Ind: Purdue University, Agricultural Experiment Station, 2012.
Lua MLA (8ú heag.)Não informado. Purdue Agriculture Reports. Purdue University, Agricultural Experiment Station, 2012.
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