Não informado. (1967). Phosphorus in agriculture. International Superphosphate and Compound Manufacturers Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Phosphorus in Agriculture. London: International Superphosphate and Compound Manufacturers Association, 1967.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Phosphorus in Agriculture. International Superphosphate and Compound Manufacturers Association, 1967.
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