Prastiyono, H.; Utaya, S.; Sumarmi, S.; Astina, I. K.; Amin, S.; Aliman, M. Development of E-Learning, Mobile Apps, Character Building, and Outdoor Study (EMCO Learning Model) to Improve Geography Outcomes in the 21st Century. Int. J. Interact. Mob. Technol. 2021, 15, pp. 107-122.