@book{6526,
	author = {Pasternak, Boris Leonidovich and Ujanova, Natalia},
	title = {El doctor Zhivago},
	publisher = {Ediciones Cátedra},
	year = {2007},
	series = {Letras universales},
	address = {Madrid},
	edition = {Séptima edición, Undécima edición}
}