http://repository.uhamka.ac.id/id/eprint/16343/
Prosedur Perhitungan dalam Metode Gross Up Pajak Penghasilan 21 Pegawai Tetap PT. X
Muhammad, Taruna Insan Cendekia
http://repository.uhamka.ac.id/id/eprint/16343/1/FEB_PJKD3_1702033043_TARUNA%20INSAN%20CENDEKIA%20MUHAMMAD.pdf