Kumullah, Rahmah, and Khaerun Tayibu. “Multimedia Development of Android Based Mathematics Learning in Elementary School Students”. Journal of Education and Learning Mathematics Research (JELMaR) 2, no. 1 (May 20, 2021): 11-15. Accessed January 23, 2022. http://jelmar.wisnuwardhana.ac.id/index.php/jelmar/article/view/44.