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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)South Dakota State College of Agriculture and Mechanic Arts. Economics Department و South Dakota Agricultural Experiment Station. Agricultural Economics Pamphlet. Brookings, S.D.: Dept. of Agricultural Economics, Agricultural Experiment Station, South Dakota State College, 1942.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)South Dakota State College of Agriculture and Mechanic Arts. Economics Department و South Dakota Agricultural Experiment Station. Agricultural Economics Pamphlet. Dept. of Agricultural Economics, Agricultural Experiment Station, South Dakota State College, 1942.