@book{2066,
	author = {Smallman, John  and Walcox, E. H. },
	title = {Art of a Capella singing / },
	publisher = {Oliver Ditson, },
	year = {1933},
	address = {s/l : },
	edition = {1 ed.},
	note = {contiene 16 trabajos representativos, con intrucciones para cantar en grupos corales}
}