@book{71556,
	author = {Söderberg, Hjalmar and Söderberg, Hjalmar},
	title = {El juego serio},
	publisher = {Nordica Libros, },
	year = {[Fecha de publicación no identificada]},
	address = {[Madrid, España] :},
	url = {https://public.digitaliapublishing.com/a/98743}
}