Não informado. (1975). Paper Technology and Industry. British Paper and Board Industry Federation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Paper Technology and Industry. London: British Paper and Board Industry Federation, 1975.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Paper Technology and Industry. British Paper and Board Industry Federation, 1975.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.