@book{9221,
	author = {Piedrola Gil, G.},
	title = {Medicina preventiva y salud publica /},
	publisher = {Ediciones Cientificas y Tecnicas,},
	year = {1991.},
	address = {Barcelona :},
	edition = {9a ed.},
	note = {Incluye bibliografias e indice.}
}