Purdue University. Agricultural Experiment Station. (1957). Research bulletin. [Agricultural Experiment Station, Purdue University].
Chicago-referens (17:e uppl.)Purdue University. Agricultural Experiment Station. Research Bulletin. West Lafayette, Ind.: [Agricultural Experiment Station, Purdue University], 1957.
MLA-referens (8:e uppl.)Purdue University. Agricultural Experiment Station. Research Bulletin. [Agricultural Experiment Station, Purdue University], 1957.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.