@book{67025,
	author = {Russell, Marian E.},
	title = {Didáctica de las ciencias aplicada a la escuela elemental, técnicas y materiales},
	publisher = {Editorial F. Trillas},
	year = {1970},
	address = {México},
	edition = {1. ed.},
	note = {Translation of : Teaching science in normal schools}
}