Pascal James Imperato has written extensively on West African art and culture, with material relevant to the Voltaic basin and the ethnic groups of southern Burkina Faso and northern Ghana; his historical surveys of the region remain useful reference works.
Susan Domowitz produced important scholarship on Kassena art and textiles, focusing on the symbolic content of surface decoration in this part of West Africa — directly relevant to what you will see in Tiébélé.
Africa Overland by Sian Pritchard-Jones and Bob Gibbons (Trailblazer) covers the practical realities of overlanding through West and Central Africa and includes coverage of Burkina Faso; useful for context on getting around the region.
Thomas A. Hale, Griots and Griottes: Masters of Words and Music — a study of the West African oral tradition that provides cultural background on the Sahelian and sub-Sahelian societies of which Kassena culture is a part.