Não informado. (1977). Current problems in obstetrics and gynecology. Year Book Medical Publishers.
Lua i Stíl Chicago (17ú heag.)Não informado. Current Problems in Obstetrics and Gynecology. Chicago, Ill: Year Book Medical Publishers, 1977.
Lua MLA (8ú heag.)Não informado. Current Problems in Obstetrics and Gynecology. Year Book Medical Publishers, 1977.
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