Harahap, S., Harahap, R.H. and Mohd Roslan Moh Nor 2026. Customary Negotiation and Islamic Environmental Law: Human-Nature Relations in the Batak Angkola Community, South Tapanuli, Indonesia. Ijtihad : Jurnal Wacana Hukum Islam dan Kemanusiaan. 26, 1 (Jun. 2026), 1–36. DOI:https://doi.org/10.18326/ijtihad.v26i1.1-36.