@book{4430,
	author = {Campbell, Stuart.},
	title = {Obstetrics by ten teachers},
	publisher = {Book power,},
	year = {2000.},
	address = {London,},
	edition = {17th ed.},
	url = {https://www.google.com.pk/search?tbm=bks&hl=en&q=%3A+Obstetrics+by+ten+teachers}
}