Não informado. (2004). Inspection report. Purdue University, Agricultural Experiment Station.
Chicago-referens (17:e uppl.)Não informado. Inspection Report. Lafayette, Ind: Purdue University, Agricultural Experiment Station, 2004.
MLA-referens (8:e uppl.)Não informado. Inspection Report. Purdue University, Agricultural Experiment Station, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.