Thing, T. C., Shan, L. Y., Ping, T. S., Awang, K., Nafiah, M. A. and Ahmad, K. (2014) “Phytochemical study of stem bark from Alstonia spathulata Bl. (Apocynaceae) (8 - 15)”, EDUCATUM Journal of Science, Mathematics and Technology, 1(2), pp. 8–15. Available at: https://ejournal.upsi.edu.my/index.php/EJSMT/article/view/19 (Accessed: 26 April 2024).