United Nations. Statistical Office. (1951). Demographic yearbook 1951. Statistical Office of the United Nations.
Chicago Style aipamenaUnited Nations. Statistical Office. Demographic Yearbook 1951. Dept.of.Economic Affairs: Statistical Office of the United Nations, 1951.
MLA aipamenaUnited Nations. Statistical Office. Demographic Yearbook 1951. Statistical Office of the United Nations, 1951.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.