@book{814,
	author = {Atchley, Robert C },
	title = {The social forces in later life / },
	publisher = {Wadsworth Pu. Co, },
	year = {1977},
	address = {Belmont : },
	edition = {2 ed.},
	note = {Introduccion al tema de la vejez humana, con enfasis particular en los aspectos sociales y psicosociales}
}