Não informado. (1939). Feed situation. U.S. Department of Agriculture, Bureau of Agricultural Economics.
Chicago-Zitierstil (17. Ausg.)Não informado. Feed Situation. Washington: U.S. Department of Agriculture, Bureau of Agricultural Economics, 1939.
MLA-Zitierstil (8. Ausg.)Não informado. Feed Situation. U.S. Department of Agriculture, Bureau of Agricultural Economics, 1939.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.