@book{110355,
	author = {Vélez de Pérez, Mercedes.},
	title = {Mental retardation in Puerto Rico: knowledge, beliefs, and attitudes.},
	year = {1967]},
	address = {San Juan},
	note = {At head of title: University of Puerto Rico, School of Medicine, Department of Preventive Medicine & Public Health, Basic Sample of Health & Welfare.}
}