Não informado. (1887). Bulletin of the Nebraska Agricultural Experiment Station. University of Nebraska, College of Agriculture.
Chicago-Zitierstil (17. Ausg.)Não informado. Bulletin of the Nebraska Agricultural Experiment Station. Lincoln, Neb: University of Nebraska, College of Agriculture, 1887.
MLA-Zitierstil (8. Ausg.)Não informado. Bulletin of the Nebraska Agricultural Experiment Station. University of Nebraska, College of Agriculture, 1887.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.