“The Concept of Grundnorm in the Customary Law System: Reconciliation of Hans Kelsen’s Pure Legal Theory With Indonesian Legal Pluralism”. JIHAD : Jurnal Ilmu Hukum dan Administrasi 8, no. 1 (March 1, 2026). Accessed June 22, 2026. https://ejournal.mandalanursa.org/index.php/JIHAD/article/view/10333.