Mohamed, T.K. “Chemical Constituents and Antioxidant Activity of Citrus Paradisi (Star-Ruby Red Grapefruit) and Citrus Sinensis (Blood Sweet Orange) Egyptian Cultivars”. Asian Journal of Chemistry, vol. 16, no. 3, June 2016, pp. 1753-64, https://asianpubs.org/index.php/ajchem/article/view/14415.