Putri, Ramayana Dwi. “The Influence of Project Based Learning (PJBL) Learning Model on Spatial Thinking Ability in Class X Geography Learning Eyes in SMA PGRI 2 Palembang”. Journal of Geography Science and Education 2, no. 1 (August 12, 2020): 11–16. Accessed May 5, 2024. http://journal.univetbantara.ac.id/index.php/jgse/article/view/828.