Não informado. (1955). Commercial fertilizer and plant food industry. W.W. Brown Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Commercial Fertilizer and Plant Food Industry. Atlanta, Ga: W.W. Brown Publishing, 1955.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Commercial Fertilizer and Plant Food Industry. W.W. Brown Publishing, 1955.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.