Pennsylvania. State Board of Health and Vital Statistics. The Annals of hygiene. University of Pennsylvania Press [etc.].
Chicago-referens (17:e uppl.)Pennsylvania. State Board of Health and Vital Statistics. The Annals of Hygiene. Philadelphia: University of Pennsylvania Press [etc.].
MLA-referens (8:e uppl.)Pennsylvania. State Board of Health and Vital Statistics. The Annals of Hygiene. University of Pennsylvania Press [etc.].
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.