Humedy, Israa T., and Ismael M. Ali. “Spectrophotometric Determination of Sulfathiazole Using 2,4 –dinitrophenylhydrazine As Coupling Reagent”. Ibn AL-Haitham Journal For Pure and Applied Sciences, vol. 29, no. 2, Mar. 2017, pp. 227-39, https://jih.uobaghdad.edu.iq/index.php/j/article/view/112.