THE HELENA RUBINSTEIN COLLECTION, Parke-Bernet Galleries, New York, April 1966; The Paul Guillaume collection, Ader & Rheims, Paris, November 1965; Fagg, W.: Africa, 100 Tribes - 100 Masterpieces, Berlin, 1964; Picon, G.: Arts primitifs dans les ateliers d'artistes, Paris, 1967; and three other books of related interest (7)