Não informado. (1949). South Dakota Farm & Home Research. South Dakota Agricultural Experiment Station.
Chicago-referens (17:e uppl.)Não informado. South Dakota Farm & Home Research. Brookings, SD: South Dakota Agricultural Experiment Station, 1949.
MLA-referens (8:e uppl.)Não informado. South Dakota Farm & Home Research. South Dakota Agricultural Experiment Station, 1949.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.