Não informado. (1993). Journal of Agricultural and Applied Economics. Southern Agricultural Economics Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Journal of Agricultural and Applied Economics. Auburn, Ala: Southern Agricultural Economics Association, 1993.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Journal of Agricultural and Applied Economics. Southern Agricultural Economics Association, 1993.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.