Não informado. (1891). Bulletin of the North Dakota Agricultural Experiment Station. North Dakota Agricultural Experiment Station.
Chicago-Zitierstil (17. Ausg.)Não informado. Bulletin of the North Dakota Agricultural Experiment Station. Fargo, ND: North Dakota Agricultural Experiment Station, 1891.
MLA-Zitierstil (8. Ausg.)Não informado. Bulletin of the North Dakota Agricultural Experiment Station. North Dakota Agricultural Experiment Station, 1891.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.