Não informado. Agricultural reviews and manuals. Agricultural Research Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Agricultural Reviews and Manuals. New Orleans, La: Agricultural Research Service.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Agricultural Reviews and Manuals. Agricultural Research Service.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.