Wulandaria, Nita, and Arniati Arniati. “Pengisian SPT Tahunan PPh Pasal 21 Melalui Aplikasi Pengolah Angka (Spread Sheet)”. Journal of Applied Accounting and Taxation, vol. 1, no. 1, Mar. 2016, pp. 65-71, doi:10.5281/zenodo.1307280.