Shakir, I . M.A., N. S. Turkie, and W. S. Ulaiwi. 2017. “Total Luminescence (Chemiluminescence & Fluorescence)- FIA Method For The Determination of DL-Histidine”. Ibn AL-Haitham Journal For Pure and Applied Sciences 22 (4). https://jih.uobaghdad.edu.iq/index.php/j/article/view/1167.