@book{2879,
	author = {Niswander,Kenneth R. and Evans, T (Editor)},
	title = {Manual of Obstetrics },
	publisher = {A little Brown ,},
	year = {1996 .},
	address = {Boston :},
	edition = {5th ed.},
	url = {https://books.google.com.pk/books?id=NWKW3KZv9roC&printsec=frontcover&dq=Manual+of+Obstetrics&hl=en&sa=X&ved=2ahUKEwirpIqYw9H0AhWILewKHbTlC3IQ6AF6BAgEEAI#v=onepage&q=Manual%20of%20Obstetrics&f=false}
}