@book{294840,
	author = {Pérez Sánchez, Alfredo and Siña Donoso, Enrique},
	title = {Obstetricia  / Alfredo Pérez Sánchez, Enrique Donoso Siña},
	publisher = {Mediterráneo},
	year = {2005},
	address = {Santiago de Chile},
	edition = {3a ed.}
}