Yuniar, Listya Eka, Suwito Eko Pramono, and Agustinus Sugeng Priyanto. “Environment Content-Based Teaching Material Construction for Social Studies”. JESS (Journal of Educational Social Studies) 8, no. 2 (November 11, 2019): 135-141. Accessed April 25, 2024. https://journal.unnes.ac.id/sju/jess/article/view/35335.