@book{33709,
	author = {Enkin, Murray. and Keirse, Marc J. N. C.},
	title = {A guide to effective care in pregnancy and childbirth /},
	publisher = {Oxford University Press,},
	year = {1989.},
	address = {Oxford [England] ;},
	url = {http://www.loc.gov/catdir/enhancements/fy0637/89022820-d.html}
}