Choong, Y.-K.; Mohd Yousof, N. S. A.; Jamal, J. A.; Wasiman, M. I. Determination of Anthocyanin Content in Two Varieties of Hibiscus Sabdariffa from Selangor, Malaysia Using a Combination of Chromatography and Spectroscopy. J Plant Sci Phytopathol 2019, 3, 067-075.