Não informado. (1891). Bulletin of the Washington Agricultural Experiment Station. Washington Agricultural Experiment Station.
Chicago-referens (17:e uppl.)Não informado. Bulletin of the Washington Agricultural Experiment Station. Pullman, Wash: Washington Agricultural Experiment Station, 1891.
MLA-referens (8:e uppl.)Não informado. Bulletin of the Washington Agricultural Experiment Station. Washington Agricultural Experiment Station, 1891.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.