Alsayadi M.S., M., Y. Al Jawfi, M. Belarbi, and F. Z. Sabri. “ANTIOXIDANT POTENCY OF WATER KEFIR”. Journal of Microbiology, Biotechnology and Food Sciences, vol. 2, no. 6, June 2013, pp. 2444-7, https://office2.jmbfs.org/index.php/JMBFS/article/view/7101.