World Federation of United Nations Associations. World population year bulletin. World Federation of United Nations Associations.
Chicago-referens (17:e uppl.)World Federation of United Nations Associations. World Population Year Bulletin. Geneva: World Federation of United Nations Associations.
MLA-referens (8:e uppl.)World Federation of United Nations Associations. World Population Year Bulletin. World Federation of United Nations Associations.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.