Não informado. (1973). European Journal of Obstetrics & Gynecology and Reproductive Biology. Elsevier Science Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. European Journal of Obstetrics & Gynecology and Reproductive Biology. Amsterdam: Elsevier Science Publishers, 1973.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. European Journal of Obstetrics & Gynecology and Reproductive Biology. Elsevier Science Publishers, 1973.
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