@book{90971,
	author = {Peters, Tim J.},
	title = {When to screen in obstetrics and gynecology},
	publisher = {Saunders Elsevier},
	year = {c2006},
	address = {Filadelfia (Pensilvania, Estados Unidos)},
	edition = {2a. Ed.},
	url = {http://www.loc.gov/catdir/toc/fy0604/2005044230.html}
}