Não informado. Virginia agricultural economics. Virginia Polytechnic Institute, Department of Agricultural Economics and Rural Sociology.
Chicago-Zitierstil (17. Ausg.)Não informado. Virginia Agricultural Economics. Blacksburg, Va: Virginia Polytechnic Institute, Department of Agricultural Economics and Rural Sociology.
MLA-Zitierstil (8. Ausg.)Não informado. Virginia Agricultural Economics. Virginia Polytechnic Institute, Department of Agricultural Economics and Rural Sociology.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.