Não informado. (1989). Current Opinion in Obstetrics and Gynecology. Rapid Science Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Current Opinion in Obstetrics and Gynecology. London: Rapid Science Publishers, 1989.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Current Opinion in Obstetrics and Gynecology. Rapid Science Publishers, 1989.
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