S. G. Mohammed, A. G. Al-Hashimi, and K. S. Al-Hussainy, “Determination of Caffeine and Trace Minerals Contents in Soft and Energy Drinks Available in Basrah Markets”, Pak. J. Nutr., vol. 11, no. 9, pp. 845–848, Aug. 2012, doi: 10.3923/pjn.2012.845.848.