Não informado. University of Pennsylvania medical bulletin. University of Pennsylvania, School of Medicine.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. University of Pennsylvania Medical Bulletin. Philadelphia, Pa: University of Pennsylvania, School of Medicine.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. University of Pennsylvania Medical Bulletin. University of Pennsylvania, School of Medicine.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.