Sihotang, Hotland, PurwantoM. Yanuar J., Widiatmaka Widiatmaka, and Sambas Basuni. “MODEL KONSERVASI SUMBERDAYA AIR DANAU TOBA”. Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) 2, no. 2 (December 30, 2012): 65. Accessed October 4, 2022. https://jma.journal.ipb.ac.id/index.php/jpsl/article/view/10649.