United States. Agricultural Marketing Service. Fruit and Vegetable Division. Fresh Products Branch. (1997). United States standards for grades of spinach plants: Effective November 19, 1956. U.S. Dept. of Agriculture, Agricultural Marketing Service, Fruits and Vegetable Division, Fresh Products Branch.
Chicago Style (17th ed.) CitationUnited States. Agricultural Marketing Service. Fruit and Vegetable Division. Fresh Products Branch. United States Standards for Grades of Spinach Plants: Effective November 19, 1956. [Washington, D.C.]: U.S. Dept. of Agriculture, Agricultural Marketing Service, Fruits and Vegetable Division, Fresh Products Branch, 1997.
MLA (9th ed.) CitationUnited States. Agricultural Marketing Service. Fruit and Vegetable Division. Fresh Products Branch. United States Standards for Grades of Spinach Plants: Effective November 19, 1956. U.S. Dept. of Agriculture, Agricultural Marketing Service, Fruits and Vegetable Division, Fresh Products Branch, 1997.