@book{21794,
	author = {Birney, Robert Charles,},
	title = {Teorías sobre motivación del aprendizaje /},
	publisher = {Editorial Trillas },
	year = {1976 [i.e. 1972]},
	series = {Biblioteca técnica de psicología.},
	address = {México },
	edition = {1a ed. en español.},
	note = {Date on t.p. refers to first reimpression.}
}