El-Sisi, Suzan F., et al. “Comparative Study of Some Natural and Artificial Food Coloring Agents on Hyperactivity, Learning and Memory Performance in Weanling Rats”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 21, no. 2, Apr. 2015, pp. 309-24, https://gssrr.org/JournalOfBasicAndApplied/article/view/3827.