Nasution, A. N. S., B. . Irawan, and I. H. Rambe. “Development of Ethnomathematical-Based Student Worksheets for Gordang Sambilan Musical Instruments on Cone Slice Material for Class XI SMA Primbana Medan”. Journal of Mathematics Technology and Education, vol. 1, no. 1, Dec. 2021, pp. 19-29, doi:10.32734/jomte.v1i1.7577.