Musa, Kartini. “MEMBANGUN APLIKASI PERHITUNGAN PPH21 MOBILE ANDROID FASILITATOR VALIDASI WAJIB PAJAK PRIBADI”. CESS (Journal of Computer Engineering, System and Science) 2, no. 1 (January 31, 2017): 1–11. Accessed July 4, 2025. https://jurnal.unimed.ac.id/2012/index.php/cess/article/view/4533.