@book{2090,
	author = {Vennard, William },
	title = {Singing, the mechanism and the technic / },
	publisher = {Carl Fischer, },
	year = {1968},
	address = {New York : },
	edition = {5 ed.},
	note = {Bibliografía: p 221-229,Thesaurus:p 231-263, Indice:p 265-275}
}