@book{106170,
	author = {Fernández de Cintrón, Celia and Vales, Pedro A.,},
	title = {A pilot study},
	publisher = {University of Puerto Rico},
	year = {1974.},
	series = {Puerto Rico. Universidad. Recinto de Río Piedras. Centro de Investigaciones Sociales. Publ. no. 5.},
	address = {Río Piedras, P.R.}
}