APA
U.S. Department of Agriculture, . (1968). Agriculture policies. Washington, D.C: U.S. Department of Agriculture.
Chicago
U.S. Department of Agriculture, . 1968. Agriculture policies. Washington, D.C: U.S. Department of Agriculture.
Harvard
U.S. Department of Agriculture, . (1968). Agriculture policies. Washington, D.C: U.S. Department of Agriculture.
MLA
U.S. Department of Agriculture, . Agriculture policies. Washington, D.C: U.S. Department of Agriculture. 1968.