Não informado. (1978). Farmer cooperatives. Department of Agriculture, Agricultural Cooperative Service.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Farmer Cooperatives. Washington: Department of Agriculture, Agricultural Cooperative Service, 1978.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Farmer Cooperatives. Department of Agriculture, Agricultural Cooperative Service, 1978.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.