Não informado. (2004). Harvard School of Public Health. Harvard School of Public Health.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Harvard School of Public Health. Cambridge, Inglaterra: Harvard School of Public Health, 2004.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Harvard School of Public Health. Harvard School of Public Health, 2004.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.