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.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিSouth Dakota State College of Agriculture and Mechanic Arts. Economics Department এবং South Dakota Agricultural Experiment Station. Agricultural Economics Pamphlet. Brookings, S.D.: Dept. of Agricultural Economics, Agricultural Experiment Station, South Dakota State College, 1942.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিSouth Dakota State College of Agriculture and Mechanic Arts. Economics Department এবং South Dakota Agricultural Experiment Station. Agricultural Economics Pamphlet. Dept. of Agricultural Economics, Agricultural Experiment Station, South Dakota State College, 1942.