APA-referens (7:e uppl.)

Não informado. (1958). North Dakota Farm Research. North Dakota Agricultural Experiment Station.

Chicago-referens (17:e uppl.)

Não informado. North Dakota Farm Research. Fargo, ND: North Dakota Agricultural Experiment Station, 1958.

MLA-referens (8:e uppl.)

Não informado. North Dakota Farm Research. North Dakota Agricultural Experiment Station, 1958.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.