“Antibacterial Activity of the Essensial Oils of Lempuyang wangi (Zingiber aromaticum Val.), lempuyang gajah (Zingiber zerumbet Sm), and lempuyang emprit (Zingiber amaricans Bl.) on Three Gram Negative Bacteria” (2015) Asian Journal of Applied Sciences, 3(2). Available at: https://ajouronline.com/index.php/AJAS/article/view/2561 (Accessed: 15 January 2026).