APA
U. S. Department of Agriculture, . (1972). United States standards for grades of apples. Estados Unidos de América: Department of Agriculture.
Chicago
U. S. Department of Agriculture, . 1972. United States standards for grades of apples. Estados Unidos de América: Department of Agriculture.
Harvard
U. S. Department of Agriculture, . (1972). United States standards for grades of apples. Estados Unidos de América: Department of Agriculture.
MLA
U. S. Department of Agriculture, . United States standards for grades of apples. Estados Unidos de América: Department of Agriculture. 1972.
