Tracey, A. “HUMBI EN HANDA - ANGOLA. Recording and Commentary by Gerhard Kubik. One 12” 33â…“ Rpm Disc, 1973. Belgisches Radio En Televisie 6803 044 (No. 9 of a Series Issued by the Koninklijk Museum Voor Midden-Afrika, Tervuren). Notes in German and Flemish, With Summaries in French and English, 80 pp., Music, Photos”. African Music : Journal of the International Library of African Music, vol. 5, no. 4, Nov. 1975, p. 153, doi:10.21504/amj.v5i4.1626.