“"THE STUDY OF PRIMITIVE MUSICAL INSTRUMENTS. Brief Notes on Some Existing Approaches and Systems of classification”, by David Rycroft, Review of Ethnology, Volume 1, 1969, No. 14, Pp. 1-8, and No. 15, Pp. 1-5, Institut Fur Volkerkunde, Vienna University”. African Music : Journal of the International Library of African Music, vol. 4, no. 4, Aug. 1970, p. 126, https://doi.org/10.21504/amj.v4i4.1692.