Barley, Nigel. Foreheads of the Dead: An Anthropological View of Kalabari Ancestral Screens. Washington, D.C.: Published for the National Museum of African Art by Smithsonian Institution Press, 1988.

Barley, Nigel. Foreheads of the Dead: An Anthropological View of Kalabari Ancestral Screens. Washington, D.C.: Published for the National Museum of African Art by Smithsonian Institution Press, 1988.