Text ( visual ) : unmediated Study guide for Williams obstetrics. -- 20th ed. / Larry C. Gilstrap ... [et al.]. -- Stamford, Conn. : Appleton & Lange , c1997. -- vii, 270 p. : 28 cm. -- ISBN 083859641X ; (BA42078380) ; https://ci.nii.ac.jp/ncid/BA42078380 Other Title(s): Williams Obstetrics. -- Author Heading(s): Williams, J. Whitridge (John Whitridge) ; Gilstrap, Larry C. ; Cox, Susan M. ; Brekken, Alvin L. ; Cunningham, F. Gary. -- Classification(s): LCC : RG524 ; DC20 : 618.2 ; NDC8 : 495.5. -- Subject Heading(s): PRECIS : Obstetrics ; LCSH : Obstetrics ; MESH : Obstetrics