yani, L., N. M.H, M. Zakaria, N. Abdul Rahman, and N. K. “Screening for Antimicrobial Activity of Extracts from Zingiber Officinale Rosc. Var. Rubrum Theilade”. Malaysian Journal of Science, vol. 20, no. 1, Apr. 2001, pp. 65-69, https://juku.um.edu.my/index.php/MJS/article/view/8778.