Trích dẫn APA

United States Department of Agriculture. (1981). USDA Grade Standards: For Food and Farm Products. Washington, D.C: United States Department of Agriculture.

Trích dẫn kiểu Chicago

United States Department of Agriculture. USDA Grade Standards: For Food and Farm Products. Washington, D.C: United States Department of Agriculture, 1981.

Trích dẫn MLA

United States Department of Agriculture. USDA Grade Standards: For Food and Farm Products. Washington, D.C: United States Department of Agriculture, 1981.

Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.