Arif, Syahrizal, Agus Suprijono, and Sunarto Sunarto. “Development of Social Studies Textbooks Based on Environmental Education for JHS Grade VII”. The Indonesian Journal of Social Studies 4, no. 1 (July 29, 2021): 11–18. Accessed May 5, 2024. https://journal.unesa.ac.id/index.php/jpips/article/view/12092.