Não informado. University of Pennsylvania medical bulletin. University of Pennsylvania, School of Medicine.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. University of Pennsylvania Medical Bulletin. Philadelphia, Pa: University of Pennsylvania, School of Medicine.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. University of Pennsylvania Medical Bulletin. University of Pennsylvania, School of Medicine.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.