Purba, E. C., and J.-M. Hu. “Traditional Medicine and Medicinal Plants of the Batak Karo: A Review of Ethnobotanical Studies and Research Gaps”. Ethnobotany Research and Applications, vol. 32, Dec. 2025, pp. 1-162, https://ethnobotanyjournal.org/index.php/era/article/view/7285.