Não informado. (1971). American bibliography of agricultural economics. University of Kentucky, Department of Agricultural Economics, American Agricultural Economics.
Chicago-Zitierstil (17. Ausg.)Não informado. American Bibliography of Agricultural Economics. Lexington, Ky: University of Kentucky, Department of Agricultural Economics, American Agricultural Economics, 1971.
MLA-Zitierstil (8. Ausg.)Não informado. American Bibliography of Agricultural Economics. University of Kentucky, Department of Agricultural Economics, American Agricultural Economics, 1971.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.