M. Sirat, Hasnah, and Lay Meng Lee. “Chemical Components of the Rhizome Oil of Curcuma Heyneana Val”. Malaysian Journal of Science 28, no. 3 (December 24, 2009): 232–328. Accessed January 6, 2025. http://borneojournal.um.edu.my/index.php/MJS/article/view/7640.