United States Department of Agriculture. (1981). USDA Grade Standards: For Food and Farm Products. Washington, D.C: United States Department of Agriculture.
শিকাগো স্টাইলে সাইটেশনUnited States Department of Agriculture. USDA Grade Standards: For Food and Farm Products. Washington, D.C: United States Department of Agriculture, 1981.
এমএলএ সাইটেশনUnited States Department of Agriculture. USDA Grade Standards: For Food and Farm Products. Washington, D.C: United States Department of Agriculture, 1981.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.