Não informado. (1928). Monthly list books catalogued in the Library of the United nations. United Nations Library.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Monthly List Books Catalogued in the Library of the United Nations. Geneve, Suíça: United Nations Library, 1928.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Monthly List Books Catalogued in the Library of the United Nations. United Nations Library, 1928.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.