Não informado. (1956). Fibres, engineering and chemistry. Leonard Hill Technical Group.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Fibres, Engineering and Chemistry. London: Leonard Hill Technical Group, 1956.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Fibres, Engineering and Chemistry. Leonard Hill Technical Group, 1956.
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