Iwalokun, B. and Shittu, M. 2007. Effect of Hibiscus sabdariffa (Calyce) Extract on Biochemical and Organoleptic Properties of Yogurt. Pakistan Journal of Nutrition. 6, 2 (Feb. 2007), 172–182. DOI:https://doi.org/10.3923/pjn.2007.172.182.