Não informado. (1949). South Dakota Farm & Home Research. South Dakota Agricultural Experiment Station.
Lua i Stíl Chicago (17ú heag.)Não informado. South Dakota Farm & Home Research. Brookings, SD: South Dakota Agricultural Experiment Station, 1949.
Lua MLA (8ú heag.)Não informado. South Dakota Farm & Home Research. South Dakota Agricultural Experiment Station, 1949.
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