“Preliminary Screening of Antibacterial Activity Using Crude Extracts of Hibiscus rosa sinensis ”, tlsr, vol. 20, no. 2, pp. 109–118, Dec. 2009, Accessed: Dec. 23, 2024. [Online]. Available: https://ejournal.usm.my/tlsr/article/view/tlsr_vol20-no-2-2009_9