Não informado. (1928). Monthly list books catalogued in the Library of the United nations. United Nations Library.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Monthly List Books Catalogued in the Library of the United Nations. Geneve, Suíça: United Nations Library, 1928.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Monthly List Books Catalogued in the Library of the United Nations. United Nations Library, 1928.
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