Purba, Ika Rosenta, and Nurhayati Nurhayati. “The Contribution of the Biota Diversity of Lake Toba to Indonesia’s Biota Wealth”. Jurnal Penelitian Pendidikan IPA 10, no. 2 (February 28, 2024): 996–1002. Accessed November 22, 2024. https://jppipa.unram.ac.id/index.php/jppipa/article/view/6381.