M Sianturi N, Khairul Amri Kamarudin M, Ekhwan Toriman M, Abd Wahab N, Hakparn S, Lertbunchardwong K, et al. Assessment of Environmental Management in Lake Toba, Samosir Regency, North Sumatera Province, Indonesia. IJET [Internet]. 2018 Jul. 25 [cited 2024 May 2];7(3.14):337-43. Available from: https://www.sciencepubco.com/index.php/ijet/article/view/18815