Rumiyati, Rumiyati, and Dianila Oktyawati. “Developing Kopaja.Id As a Fun Online Learning in General Tax Conditions Topic”. Jurnal Pendidikan Vokasi 10, no. 3 (December 31, 2020): 282–289. Accessed May 14, 2025. https://jurnal.uny.ac.id/index.php/jpv/article/view/36023.