Needs Analysis and Design of Martapura Kingdom Numerical Teaching Materials based on Android with the help of I-Spring suite for Elementary School students in Samarinda City. escs [Internet]. 2023 Dec. 31 [cited 2026 Aug. 3];3(1):22-38. Available from: https://jurnal.fkip.unmul.ac.id/index.php/escs/article/view/2541