Não informado. (2000). Library conservation news. British Library, National Preservation Office.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Library Conservation News. London: British Library, National Preservation Office, 2000.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Library Conservation News. British Library, National Preservation Office, 2000.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.