Não informado. (1928). Monthly list books catalogued in the Library of the United nations. United Nations Library.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Monthly List Books Catalogued in the Library of the United Nations. Geneve, Suíça: United Nations Library, 1928.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Monthly List Books Catalogued in the Library of the United Nations. United Nations Library, 1928.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.