@book{71617,
	author = {Sonntag, Robert M. and Sonntag, Robert M.},
	title = {El Gremio Secreto de los Libros},
	publisher = {Siruela, },
	year = {2015},
	series = {Las tres edades},
	address = {[Madrid, España] :},
	url = {https://public.digitaliapublishing.com/a/44721}
}