Ardila, Ayudita, Jefri Marzal, and Jodion Siburian. “The Development of Flipped Classroom Model Trigonometry Learning Tools Improves Students’ Mathematical Communication Skills”. Edumatica : Jurnal Pendidikan Matematika 11, no. 03 (December 31, 2021): 65-77. Accessed July 3, 2024. https://online-journal.unja.ac.id/edumatica/article/view/14497.