Não informado. (1969). Fertiliser, feed and pesticide journal. Association of British Organic Fertilisers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Fertiliser, Feed and Pesticide Journal. London: Association of British Organic Fertilisers, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Fertiliser, Feed and Pesticide Journal. Association of British Organic Fertilisers, 1969.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.