@Book{RANME20161215013, title = "Naturaleza, sociedad y econom\'{\i}a", author = "Andr\'{e}s \'{A}lvarez, Valent\'{\i}n", publisher = "[Madrid] : Prensa Castellana", editor = "Prensa Castellana", URL = "http://bibliotecavirtual.ranm.es/ranm/es/consulta/registro.do?id=23501", year = "1952", }