Não informado. (1887). Bulletin of the Nebraska Agricultural Experiment Station. University of Nebraska, College of Agriculture.
Chicago-referens (17:e uppl.)Não informado. Bulletin of the Nebraska Agricultural Experiment Station. Lincoln, Neb: University of Nebraska, College of Agriculture, 1887.
MLA-referens (8:e uppl.)Não informado. Bulletin of the Nebraska Agricultural Experiment Station. University of Nebraska, College of Agriculture, 1887.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.