Rahman, A. H. B., Wasino, W., & Martitah, M. (2018). Development of Social Studies Learning Module Based on Problem Based Learning with Outdoor Study to Improve Learning Outcomes of 7th Grade Junior High School Kesatrian 1 Students. Journal of Educational Social Studies, 7(2), 132-139. Retrieved from https://journal.unnes.ac.id/sju/index.php/jess/article/view/25982