Παραπομπή σε μορφή APA (7η εκδ.)

Não informado. Virginia agricultural economics. Virginia Polytechnic Institute, Department of Agricultural Economics and Rural Sociology.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Não informado. Virginia Agricultural Economics. Blacksburg, Va: Virginia Polytechnic Institute, Department of Agricultural Economics and Rural Sociology.

Παραπομπή σε μορφή MLA (8th εκδ.)

Não informado. Virginia Agricultural Economics. Virginia Polytechnic Institute, Department of Agricultural Economics and Rural Sociology.

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