@book{170551,
	author = {Steel, Robert G. D. and Martínez B., Ricardo, tr.},
	title = {Bioestadística : principios y procedimientos  /},
	publisher = { McGraw-Hill,},
	year = {1988},
	address = {México  :},
	edition = {2a ed.},
	note = {Título original: Principles and procedures of statistics. A biometrical approach}
}