@book{2858,
	author = {Creasy, Robert K.(Editor)},
	title = {Maternal-fetal medicine :principles and practice },
	publisher = {Saunders ,},
	year = {1994 .},
	address = {Philadelphia :},
	edition = {3rd ed.},
	url = {https://books.google.com.pk/books?id=JSyxQgAACAAJ&dq=072166590X&hl=en&sa=X&redir_esc=y}
}