@book{1221,
	author = {Williams, J. Whitridge and Cunningham, F. Gary.},
	title = {Williams obstetrics.},
	publisher = {Appleton & Lange,},
	year = {c1989.},
	address = {Norwalk, Conn. :},
	edition = {18th ed. },
	note = {Includes Bibliography, References and Index}
}