Elisofon, E. and Fagg, W.: La Sculpture Africaine, Paris, 1958; Fagg, W. et al.: Yoruba, Sculpture of West Africa, New York, 1987; Radin, P. (ed.): African Folktales & Sculpture, New York, 1952; Schmalenbach, W.: L'Art Nègre, Paris, 1953; Rivière, M.: Les Chefs-d'oeuvre Africains des Collections Privées Françaises, Paris, 1975; and eight others of similar interest (13)