Dyfyniad APA

Pennsylvania. State Board of Health and Vital Statistics. The Annals of hygiene. University of Pennsylvania Press [etc.].

Dyfyniad Arddull Chicago

Pennsylvania. State Board of Health and Vital Statistics. The Annals of Hygiene. Philadelphia: University of Pennsylvania Press [etc.].

Dyfyniad MLA

Pennsylvania. State Board of Health and Vital Statistics. The Annals of Hygiene. University of Pennsylvania Press [etc.].

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.