Blackmun, Barbara (1997). "Continuity and Change: The Ivories of Ovonramwen and Eweka II". African Arts. 30 (3): 68–79. doi:10.2307/3337502. JSTOR3337502.
Blackmun, Barbara (1997). "Continuity and Change: The Ivories of Ovonramwen and Eweka II". African Arts. 30 (3): 68–79. doi:10.2307/3337502. JSTOR3337502.