Ginting, Yenny Farida Br, and Mangaratua M. Simanjorang. “Development of Geogebra Assisted Mathematics Learning Devices on Two-Variable Linear Programming Material”. Journal of Educational Analytics 2, no. 1 (February 28, 2023): 57–64. Accessed June 7, 2026. https://journal.formosapublisher.org/index.php/jeda/article/view/2873.