United Nations. Statistical Office. (1949). Population census handbook. [s.n.].
Cita Chicago Style (17a ed.)United Nations. Statistical Office. Population Census Handbook. Lake Success, N. Y: [s.n.], 1949.
Cita MLA (9a ed.)United Nations. Statistical Office. Population Census Handbook. [s.n.], 1949.
Precaución: Estas citas no son 100% exactas.