APA
U.S. Department of Agriculture, . (1970). United States standards for grades of frozen asparagus. Estados Unidos de América: Department of Agriculture.
Chicago
U.S. Department of Agriculture, . 1970. United States standards for grades of frozen asparagus. Estados Unidos de América: Department of Agriculture.
Harvard
U.S. Department of Agriculture, . (1970). United States standards for grades of frozen asparagus. Estados Unidos de América: Department of Agriculture.
MLA
U.S. Department of Agriculture, . United States standards for grades of frozen asparagus. Estados Unidos de América: Department of Agriculture. 1970.
