Nonkratok, A., P. Saensouk, S. Saensouk, and C. Maknoi. “Leaf surface anatomy of curcuma L. in Northeastern Thailand”. Asia-Pacific Journal of Science and Technology, vol. 17, no. 3, Apr. 2017, pp. 443-58, https://so01.tci-thaijo.org/index.php/APST/article/view/83258.