Não informado. (2004). Harvard School of Public Health. Harvard School of Public Health.
Chicago-Zitierstil (17. Ausg.)Não informado. Harvard School of Public Health. Cambridge, Inglaterra: Harvard School of Public Health, 2004.
MLA-Zitierstil (8. Ausg.)Não informado. Harvard School of Public Health. Harvard School of Public Health, 2004.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.