South Dakota Agricultural Experiment Station. (1939). Technical bulletin. Agricultural Experiment Station, South Dakota State College of Agriculture and Mechanical Arts.
Chicago-viite (17. p.)South Dakota Agricultural Experiment Station. Technical Bulletin. Brookings, S.D.: Agricultural Experiment Station, South Dakota State College of Agriculture and Mechanical Arts, 1939.
MLA-viite (8. p.)South Dakota Agricultural Experiment Station. Technical Bulletin. Agricultural Experiment Station, South Dakota State College of Agriculture and Mechanical Arts, 1939.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.