South Dakota State College of Agriculture and Mechanic Arts. Economics Department & South Dakota Agricultural Experiment Station. (1942). Agricultural economics pamphlet. Dept. of Agricultural Economics, Agricultural Experiment Station, South Dakota State College.
Παραπομπή σε μορφή Chicago (17η εκδ.)South Dakota State College of Agriculture and Mechanic Arts. Economics Department και South Dakota Agricultural Experiment Station. Agricultural Economics Pamphlet. Brookings, S.D.: Dept. of Agricultural Economics, Agricultural Experiment Station, South Dakota State College, 1942.
Παραπομπή σε μορφή MLA (8th εκδ.)South Dakota State College of Agriculture and Mechanic Arts. Economics Department και South Dakota Agricultural Experiment Station. Agricultural Economics Pamphlet. Dept. of Agricultural Economics, Agricultural Experiment Station, South Dakota State College, 1942.