Ardin, Galih. “Okun’s Law, Phillips Curve and Its Effect on the Growth of Income Tax Article 21 Payments During Covid-19 Pandemic”. Scientax: Jurnal Kajian Ilmiah Perpajakan Indonesia 4, no. 2 (April 27, 2023): 261–273. Accessed December 22, 2024. https://ejurnal.pajak.go.id/st/article/view/426.