Konrad Tuchscherer, African Script and Scripture: The History of the Kikakui (Mende) Writing System for Bible Translations," African Languages and Cultures, 8, 2 (1995), pp. 169–188. <https://www.jstor.org/stable/1771691>
Web page titled "HELMET MASK/Ndoli Jowei" at the Newberger Museum of Art website, dated June 2, 2005, updated November 19, 2008, retrieved September 11, 2009