@book{174469,
	author = {Orton, Anthony.},
	title = {Didáctica de las matemáticas},
	publisher = {Ministerio de Educación y Ciencia},
	year = {1990.},
	series = {Educacion Infantil y Primaria},
	address = {Madrid},
	note = {Translation of: Learning mathematics. Issues, theory, and classroom practice.}
}