N. Hidayah, S. Sukirno, P. S. P. Hutama, and F. N. Sayekti, “Peningkatan Kompetensi Pajak dengan Pelatihan Perhitungan PPh 21 Berbasis Tarif Efektif Rata-rata pada Guru Akuntansi SMK di Kota Yogyakarta: Enhancing Tax Competence through Income Tax Article 21 Calculation Training Based on the Average Effective Rate for Vocational High School Accounting Teachers in Yogyakarta City”, Pengabdianmu J Ilmiah Pengabdian Masyarakat, vol. 11, no. Suppl-1, Jan. 2026.