@book{48940,
	author = {Biesanz, John Berry and Biesanz, Mavis Hiltunen},
	title = {Introducción a la sociología},
	publisher = {Editorial Letras},
	year = {1971.},
	series = {Prentice-Hall sociology series},
	address = {México},
	note = {Updated 1971 with the addition of a new introd. (xxxi p.): "Updated for the 70's; freedom and control in a complex and changing world."}
}