@book{77698,
	author = {Beckmann, Charles R. B and American College of Obstetricians and Gynecologists},
	title = {Obstetrics and gynecology},
	publisher = {Wolters Kluwer Health/Lippincott Williams & Wilkins,},
	year = {2014},
	address = {Philadelphia :},
	edition = {7th ed}
}