@book{16275,
	author = {Callahan, Tamara L. and Caughey, Aaron B.},
	title = {Blueprints obstetrics & gynecology /},
	publisher = {Lippincott Williams & Wilkins,},
	year = {c2007.},
	address = {Philadelphia :},
	edition = {4th ed.},
	url = {http://www.loc.gov/catdir/toc/ecip068/2006005386.html}
}