Population Reports: Population Information Program. The John Hopkims Universtity School of Hygiene and Public Health. Population Information Program.
Chicago-referens (17:e uppl.)Population Reports: Population Information Program. The John Hopkims Universtity School of Hygiene and Public Health. Maryland, Estados Unidos: Population Information Program.
MLA-referens (9:e uppl.)Population Reports: Population Information Program. The John Hopkims Universtity School of Hygiene and Public Health. Population Information Program.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.