Smidt, W. G. C. “A War-Song on Yoḥannəs IV Against the Egyptians, Recited by Ləğ Täfäri in Aksum, 1906”. Studies in African Languages and Cultures, no. 41, Dec. 2007, pp. 107-31, https://salc.uw.edu.pl/index.php/SALC/article/view/487.