Não informado. (1969). World surface coatings abstracts. Paint Research Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. World Surface Coatings Abstracts. London: Paint Research Association, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. World Surface Coatings Abstracts. Paint Research Association, 1969.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.