Abd. Malek, Sri Nurestri, Halijah Ibrahim, Hong Sok Lai, Lee Guan Serm, Chan Kam Seng, Mashitah Mohd. Yusoff, and Nor Azah Mohd. Ali. 2005. “Essential Oils of Zingiber Ottensii Valet. and Zingiber Zerumbet (L.) Sm. From Sabah, Malaysia”. Malaysian Journal of Science 24 (1):49-58. https://samudera.um.edu.my/index.php/MJS/article/view/17162.