Wang, Ling, et al. “Antioxidant Activity and Melanogenesis Inhibitory Effect of Acerola Fruit (Malpighia Glabra L.) Aqueous Extract and Its Safe Use in Cosmetics”. Asian Journal of Chemistry, vol. 27, no. 3, Jan. 2015, pp. 957-60, doi:10.14233/ajchem.2015.17771.