Não informado. (1969). IFLA Annual. International Federation of Library Associations and Institutions.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. IFLA Annual. Munich, Alemanha: International Federation of Library Associations and Institutions, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. IFLA Annual. International Federation of Library Associations and Institutions, 1969.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.