@book{4899,
	author = {Schorge, John O. and Schorge, John O.},
	title = {Williams gynecology },
	publisher = {McGraw-Hill Medical},
	year = {2008},
	address = {New York },
	edition = {Nil},
	url = {http://www.loc.gov/catdir/enhancements/fy0806/2007049524-b.html}
}