ALLISON, P.: CROSS RIVER MONOLITHS, Lagos, 1968; Eyo, E.: Two Thousand years Nigerian Art, Lagos, 1977; Horton, R.: Kalabari Sculpture, Apapa, 1965; Ottenberg, S.: Masked Rituals of Afikpo, Washington, 1975; Boston, J.S.: Ikenga, London, 1977; Cole, H.M.: Mbari, Bloomington, 1982; Jones, G.I.: The Art of Eastern Nigeria, Cambridge, 1984; and 19 other books and periodicals of Nigerian interest (28)