Irvanda, Rico, et al. “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”. Science and Environmental Journal for Postgraduate, vol. 7, no. 2, Jan. 2026, pp. 102-10, doi:10.24036/senjop.v7i2.297.