Não informado. (2021). Station Bulletin. Purdue University, Agricultural Experiment Station.
Chicago-referens (17:e uppl.)Não informado. Station Bulletin. Lafayette, Ind: Purdue University, Agricultural Experiment Station, 2021.
MLA-referens (8:e uppl.)Não informado. Station Bulletin. Purdue University, Agricultural Experiment Station, 2021.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.