@book{31380,
	author = {Ling, Frank W.},
	title = {Step-up to obstetrics and gynecology  /},
	publisher = {Wolters Kluwer Health / Lippincott Williams & Wilkins,},
	year = {2015},
	address = {Philadelphia :},
	url = {http://192.168.201.76/multim/m10050/cover10050.jpg}
}