Muhammad Arif Suparman, and Tamaulina Br. Sembiring. “CHALLENGES IN THE IMPLEMENTATION OF LAW NUMBER 21 OF 2019 ON THE QUARANTINE OF ANIMALS, FISH, AND PLANTS IN PREVENTING THE ENTRY OF QUARANTINE FISH PESTS AND DISEASES IN NORTH SUMATRA”. Multidiciplinary Output Research For Actual and International Issue (MORFAI), vol. 5, no. 2, July 2025, pp. 3645-5, doi:10.54443/morfai.v5i2.3742.