Farras, A. ., K. I. . Muliawati, V. . Yuliana, and N. Nofryanti. “The Implementation of the CoreTax System to Improve the Performance of Withholding Tax Certificate (Bupot) Preparation for Article 21 Income Tax: A Qualitative Approach”. TOFEDU: The Future of Education Journal, vol. 4, no. 9, Dec. 2025, pp. 5287-92, doi:10.61445/tofedu.v4i9.1339.