Não informado. (1955). Commercial fertilizer and plant food industry. W.W. Brown Publishing.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Commercial Fertilizer and Plant Food Industry. Atlanta, Ga: W.W. Brown Publishing, 1955.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Commercial Fertilizer and Plant Food Industry. W.W. Brown Publishing, 1955.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.