South Dakota Agricultural Experiment Station. (1964). Economics pamphlet. Agricultural Experiment Station, South Dakota State University.
Chicago-referens (17:e uppl.)South Dakota Agricultural Experiment Station. Economics Pamphlet. Brookings, S.D.: Agricultural Experiment Station, South Dakota State University, 1964.
MLA-referens (8:e uppl.)South Dakota Agricultural Experiment Station. Economics Pamphlet. Agricultural Experiment Station, South Dakota State University, 1964.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.