@book{68347,
	author = {Van Dalen, Deobold B.},
	title = {Manual de técnica de la investigación educacional},
	publisher = {Editorial Paidós},
	year = {1971.},
	series = {Biblioteca de Educador Contempóraneo ; Serie Fundamental},
	address = {Buenos Aires},
	note = {Translation of : Understanding educational research.}
}