Não informado. (1939). Tin and its uses. International Tin Research Institute.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Tin and Its Uses. London: International Tin Research Institute, 1939.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Tin and Its Uses. International Tin Research Institute, 1939.
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