South Dakota Agricultural Experiment Station. (1939). Technical bulletin. Agricultural Experiment Station, South Dakota State College of Agriculture and Mechanical Arts.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিSouth Dakota Agricultural Experiment Station. Technical Bulletin. Brookings, S.D.: Agricultural Experiment Station, South Dakota State College of Agriculture and Mechanical Arts, 1939.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিSouth Dakota Agricultural Experiment Station. Technical Bulletin. Agricultural Experiment Station, South Dakota State College of Agriculture and Mechanical Arts, 1939.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.