Wulandaria, N., and A. 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.