Abd Malek, S. N., Ibrahim, H., Sok Lai, H., Guan Serm, L., Kam Seng, C., & Ali, N. A. M. (2005). The Essential Oils of Zingiber officinale Variants. Malaysian Journal of Science, 24(2), 37–43. Retrieved from http://mojes.um.edu.my/index.php/MJS/article/view/8306