Não informado. (1981). Progress in Obstetrics and Gynaecology. Churchill Livingstone.
Chicago-viite (17. p.)Não informado. Progress in Obstetrics and Gynaecology. New York: Churchill Livingstone, 1981.
MLA-viite (8. p.)Não informado. Progress in Obstetrics and Gynaecology. Churchill Livingstone, 1981.
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