Hariyadi, Slamet, Sugiyo Sugiyo, and Masrukan Masrukan. 2019. “Ethnomatematics Contain In Problem Based Learning to Improve Students Understanding about Geometry by Using Concept Of Cultural Buildings in Semarang”. Journal of Primary Education 7 (2), 235–242. https://journal.unnes.ac.id/sju/jpe/article/view/29672.