Não informado. Pakistan Journal of Health. Institute of Hygiene and Preventive Medicine.
Chicago-referens (17:e uppl.)Não informado. Pakistan Journal of Health. Lahore, Paquistao: Institute of Hygiene and Preventive Medicine.
MLA-referens (8:e uppl.)Não informado. Pakistan Journal of Health. Institute of Hygiene and Preventive Medicine.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.