Al-Haidari, Abdumuhsin A., et al. “Adsorptive Removal Of Congo Red From Aqueous Solution By Local Chaff Surface: Thermodynamics And Kinetics Studies”. Ibn AL-Haitham Journal For Pure and Applied Sciences, vol. 26, no. 2, Apr. 2017, pp. 166-77, https://jih.uobaghdad.edu.iq/index.php/j/article/view/462.