“Studi Morfologi Sungai Asahan Hulu Wilayah Sungai (WS) Toba Asahan Provinsi Sumatra Utara”. Journal of Civil Engineering and Technology Sciences 1, no. 2 (January 14, 2023): 39–55. Accessed March 25, 2025. https://jurnal2.untagsmg.ac.id/index.php/jcets/article/view/370.