PERROIS, L.: STATUAIRE FAN GABON, Paris, 1972; Arts du Gabon, Paris, 1979; Ancestral Art of Gabon, Geneva, 1985; Bourgeois, A.: Art of the Yaka and Suku, Paris, 1984; Biebuyck, D.: The Arts of Zaire, Berkeley, 1985; and nine others of similar interest (14)