@book{126837,
	author = {Sánchez Hidalgo, Efraín Sigisfredo and Ayéndez de Sánchez Hidalgo, Lydia.},
	title = {La psicología de la vejez},
	publisher = {Editorial Universitaria, Universidad de P. R},
	year = {1971.},
	address = {Río Piedras, P. R.}
}