Azizah, Siti, and Budiwirman Budiwirman. “The Historical Site of Mbah Soero Coal Mine Pit Sawahlunto, West Sumatra, As a Learning Resource for Social Science Education”. LANGGAM: International Journal of Social Science Education, Art and Culture 4, no. 1 (March 21, 2025): 13-20. Accessed April 4, 2025. http://langgam.ppj.unp.ac.id/index.php/jurnal/article/view/208.