@book{69016,
	author = {Walker, Hill M., and Hiatt, Nancy Buckley},
	title = {Técnicas de reforzamiento con fichas},
	publisher = {Editorial Fontanella},
	year = {1976.},
	series = {Conducta humana},
	address = {Barcelona},
	note = {Translation of Token reinforcement techniques; classroom applications for the hard-to-teach child.}
}