@book{19265,
	author = {Hulley, Stephen B. and Cummings, Steven R.},
	title = {Diseño de estudios clínicos /},
	publisher = {Wolters Kluwer,},
	year = {2014},
	address = {Philadelphia : },
	edition = {Cuarta edición},
	note = {Indice de contenido.}
}