$Rev ed of: William Obstetrics، a study guide،Charlers R B# $Beckmann، Barbara M Barzanksy، Frank W Ling 1st ed#، 1985 $Reprint of the 2nd ed# $Companion v to: Williams Obstetrics 18th ed# $1989، pubby Prentice - Hall International، London#
Beckmann، Charles R B Williams Obstetrics: a study guide Williams، J Whitridge )John Whitridge(، 1866 - 1931 Obstetrics