Barakat A F Kamel, Olfat O Neif, Hanan G Shaaban, and Mohammed A K Alsouz. “Characterization and Spectroscopic Study of 4- (4-Nitro Benzene Azo)-3- Amino Benzoic Acid Compound by Gaussian 09 Program: A Review”. International Journal of Research in Pharmaceutical Sciences, vol. 10, no. 2, May 2019, pp. 787-90, https://ijrps.com/home/article/view/4013.