@book{57860,
	author = {Ary, Donald. and Jacobs, Lucy Cheser},
	title = {Introducción a la investigación pedagógica},
	publisher = {McGraw-Hill Interamericana de México, S.A, de C.V.},
	year = {1989.},
	address = {México},
	edition = {2a. ed},
	note = {Translation of: Introduction to research in education.}
}