R. Irvanda, A. Frinaldi, and R. Rembrandt, “The Analysis of the Broken Law Enforcement Chain of Regional Regulation No. 4/2019 Sanctions: A Study on Apparatus Constraints (Environmental Services) and Perception of Sanction Credibility in Payakumbuh City”, SENJOP, vol. 7, no. 2, pp. 102–110, Jan. 2026.