S. N. Mayangsari, A. N. Khamida, and D. Mumtaza, “Exploration Gamification of Trigonometric Equations in High School Studens within the Joyful Learning Framework”, JELMaR, vol. 7, no. 1, pp. 22–28, May 2026, doi: 10.37303/jelmar.v7i1.33.