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A small comparative vocabulary of Bongo Baka Yulu Kara . Stefano Santandrea (1963) · Roma: Sodality of St.~Peter

Die Gbaya-Sprache (Dar-Fertit) ( pp. 53-82 ) . B. Struck (1930) · Mittheilungen des Seminars für Orientalische Sprachen. XXIII

Lenguas Indígenas del Ecuador II: La Lengua Kára ( pp. 28-52 ) . Luis T. Paz y Miño (1941) · Boletín de la Academia Nacional de Historia. XXI (57) ·

Brief Grammar: Outlines of the Yulu and Kara Languages . Santandrea, Stefano (1970) · Editrice Nigrizia