Purnomo, V.D. , Supeno , B.J. and Lisdiyono , E. 2024. The Role of Customary Law in the Development of National Law in the Modern Era. Formosa Journal of Sustainable Research. 3, 10 (Oct. 2024), 2143–2154. DOI:https://doi.org/10.55927/fjsr.v3i10.11945.