Rosa Delima Lumbantungkup, Widya Asmara, and Vivina Marpaung. 2024. “Analysis of the Development of Learning Models in Geography at Parulian 2 Private High School, Medan”. Jurnal Multidisiplin Sahombu 4 (02):509-12. https://ejournal.seaninstitute.or.id/index.php/JMS/article/view/5899.