Tahar, A., and A. K. Rachman. “Pengaruh Faktor Internal Dan Faktor Eksternal Terhadap Kepatuhan Wajib Pajak”. Journal of Accounting and Investment, vol. 15, no. 1, Mar. 2016, pp. 56-67, https://journal.umy.ac.id/index.php/ai/article/view/1316.