APA

United States Departament of Agriculture U., . (1919). United State Department of Agriculture : Bulletin. Washington: United States Departament of Agriculture.

Chicago

United States Departament of Agriculture Usda, . 1919. United State Department of Agriculture : Bulletin. Washington: United States Departament of Agriculture.

Harvard

United States Departament of Agriculture U., . (1919). United State Department of Agriculture : Bulletin. Washington: United States Departament of Agriculture.

MLA

United States Departament of Agriculture Usda, . United State Department of Agriculture : Bulletin. Washington: United States Departament of Agriculture. 1919.