APA-referens (7:e uppl.)

Não informado. (2004). Harvard School of Public Health. Harvard School of Public Health.

Chicago-referens (17:e uppl.)

Não informado. Harvard School of Public Health. Cambridge, Inglaterra: Harvard School of Public Health, 2004.

MLA-referens (8:e uppl.)

Não informado. Harvard School of Public Health. Harvard School of Public Health, 2004.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.