@book{50428,
	author = {Villee, Claude Alvin.},
	title = {Biología},
	publisher = {Interamericana,},
	year = {1981},
	address = {México, D.F. :},
	edition = {7 ed.},
	note = {c.2-4 pub. por Mc Graw - Hill, 1988}
}