“ANTIOXIDANT PROPERTIES OF HIBISCUS: SPECIES VARIATION, ALTITUDINAL CHANGE, COASTAL INFLUENCE AND FLORAL COLOUR CHANGE”. JOURNAL OF TROPICAL FOREST SCIENCE 21, no. 4 (June 15, 2022): 307–315. Accessed November 27, 2025. https://jtfs.frim.gov.my/jtfs/article/view/822.