Roy, C.: Art of the Upper Volta Rivers, Meudon, 1987; Laude, J.: African art of the Dogon, New York, 1973; Leiris, M. and Damase, J.: Sculpture of the Tellem and Dogon, London, 1959; Fischer, E. and Himmelheber, H.: Die Kunst der Dan, Zurich, 1976; Mercier, P.: Les Ase du Musée d'Abomey, Dakar, 1952; and twenty-seven others of similar interest (32)