APA

United States Departament of Agriculture U., . (1969). Yearbook of agriculture 1969 : food for us all. Washington: United States Government Printing Office.

Chicago

United States Departament of Agriculture Usda, . 1969. Yearbook of agriculture 1969 : food for us all. Washington: United States Government Printing Office.

Harvard

United States Departament of Agriculture U., . (1969). Yearbook of agriculture 1969 : food for us all. Washington: United States Government Printing Office.

MLA

United States Departament of Agriculture Usda, . Yearbook of agriculture 1969 : food for us all. Washington: United States Government Printing Office. 1969.