@book{109916,
	author = {Pérez Martínez, Aurelio. and Díaz Cubero, José H.},
	title = {El mundo y mi comunidad},
	publisher = {Cultural Puertorriqueña},
	year = {1968.},
	address = {San Juan, P.R.},
	note = {Estudios Sociales para el tercer grado.}
}