Não informado. (1933). Population. International Union for the Scientific Investigation of Population.
Chicago-Zitierstil (17. Ausg.)Não informado. Population. London: International Union for the Scientific Investigation of Population, 1933.
MLA-Zitierstil (8. Ausg.)Não informado. Population. International Union for the Scientific Investigation of Population, 1933.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.