Panjaitan, D. E., R. S. . Sinaga, and W. Warjio. “Implementation of Groundwater Tax Services and Improvement in the Application of Electronic-Based Regional Revenue Management Information System (E-Simpatda) at the Langkat Regency Revenue Agency”. Journal of Public Representative and Society Provision, vol. 5, no. 2, Apr. 2025, pp. 326-31, doi:10.55885/jprsp.v5i2.518.