Não informado. (1979). Advances in agricultural technology. Agricultural Research Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Advances in Agricultural Technology. New Orleans, La: Agricultural Research Service, 1979.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Advances in Agricultural Technology. Agricultural Research Service, 1979.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.