Sir William BLACKSTONE, Samuel Warren (1856). “Blackstone's Commentaries systematically abridged and adapted to the existing state of the law and constitution, with great additions. By Samuel Warren”, p.101
"La Crise mondiale d'aujourd'hui. Pour de profondes réformes des institutions financières et monétaires" by Maurice Allais, Clément Juglar, Paris, (p. 74), 1999.