Não informado. (1976). Quick bibliography series. National Agricultural Library, Department of Agriculture.
Chicago-Zitierstil (17. Ausg.)Não informado. Quick Bibliography Series. Beltsville, Md: National Agricultural Library, Department of Agriculture, 1976.
MLA-Zitierstil (8. Ausg.)Não informado. Quick Bibliography Series. National Agricultural Library, Department of Agriculture, 1976.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.