@book{50688,
	author = {Tumin, Melvin Marvin and Feldman, Arnold S.},
	title = {Social class and social change in Puerto Rico},
	publisher = {Bobbs-Merrill},
	year = {[1971]},
	series = {A Social Science Research Center study},
	address = {Indianapolis},
	edition = {2. ed.},
	note = {920603}
}