1. Albert Ott, “Akan Gold Weights,” Transactions of the Historical Society of Ghana 9 (1968).
2. P.A. Allison, African Stone Sculpture (London, 1968).
3. P.A. Allison, Cross River Monoliths (Lagos, 1968).
4. P.A. Allison, “Mask Makers and Myth in Western Liberia” in Anthony Forge (ed.), Primitive Art and Society (London/New York, 1973).
5. Anthony Forge (ed.), Primitive Art and Society (London/New York, 1973).