@book{92409,
	author = {Cofer, Charles Norval. and Appley, Mortimer H.},
	title = {Psicología de la motivación :},
	publisher = {Editorial Trillas,},
	year = {1971.},
	series = {Biblioteca técnica de psicología},
	address = {Mexico :},
	note = {Translation of : Motivation : theory and research.}
}