Não informado. (1928). Monthly list books catalogued in the Library of the United nations. United Nations Library.
Chicago-referens (17:e uppl.)Não informado. Monthly List Books Catalogued in the Library of the United Nations. Geneve, Suíça: United Nations Library, 1928.
MLA-referens (8:e uppl.)Não informado. Monthly List Books Catalogued in the Library of the United Nations. United Nations Library, 1928.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.