Omar, S. ., M. S. . Sidik, A. . Mamat, and . M. . Sanny. “Phytochemical Analysis, Total Phenolic Content and Antioxidant Activity of Two Varieties of Hibiscus Sabdariffa L. Leaves”. Journal of Tropical Resources and Sustainable Science (JTRSS), vol. 11, no. 2, Dec. 2023, pp. 41-48, doi:10.47253/jtrss.v11i2.1241.