Não informado. (1957). Canadian Journal of Soil Science. Agricultural Institute of Canada.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Canadian Journal of Soil Science. Ottawa: Agricultural Institute of Canada, 1957.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Canadian Journal of Soil Science. Agricultural Institute of Canada, 1957.
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