@book{52860,
	author = {Groot, A. de. and Escuelas Internacionales.},
	title = {Máquinas elementales / },
	editor = {Nebreda)},
	publisher = {Escuelas Internacionales, },
	year = {1960 (},
	address = {Madrid : },
	edition = {[1ª ed.].}
}