Não informado. University of Pennsylvania medical bulletin. University of Pennsylvania, School of Medicine.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. University of Pennsylvania Medical Bulletin. Philadelphia, Pa: University of Pennsylvania, School of Medicine.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. University of Pennsylvania Medical Bulletin. University of Pennsylvania, School of Medicine.
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