@book{56015,
	author = {Morales, Mariana de Js. and Díaz, Rafael Guillermo},
	title = {Matemática y ciencias naturales :},
	publisher = {Secretaria de Estado de Educación Bellas Artes y Cultos,},
	year = {1994.},
	address = {Santo Domingo :},
	note = {6to. grado}
}