Não informado. University of Pennsylvania medical bulletin. University of Pennsylvania, School of Medicine.
Chicago-Zitierstil (17. Ausg.)Não informado. University of Pennsylvania Medical Bulletin. Philadelphia, Pa: University of Pennsylvania, School of Medicine.
MLA-Zitierstil (8. Ausg.)Não informado. University of Pennsylvania Medical Bulletin. University of Pennsylvania, School of Medicine.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.