Sari, Siska Permata. “Ethnomathematics: Exploration of The Concept of Geometry and Arithmetics Social at Jam Gadang Bukittinggi in Learning Primary School Mathematics”. Jurnal Pendidikan Tambusai, vol. 8, no. 2, July 2024, pp. 30543-50, http://jptam.org/index.php/jptam/article/view/17914.