@book{155819,
	author = {Dietzgen, Joseph},
	title = {La esencia del trabajo intelectual humano},
	publisher = {Edición Fundamentos},
	year = {1977.},
	series = {Āgora (Crítica Religión Sociedad)},
	address = {Madrid},
	note = {Translation of: Das Wesen der menschlichen Kopfarbeit.}
}