Não informado. (1951). Fertilizers. Food and Agriculture Organization of the United Nations.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Fertilizers. Rome: Food and Agriculture Organization of the United Nations, 1951.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Fertilizers. Food and Agriculture Organization of the United Nations, 1951.
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