Hum, G. M., E. Effendi, and A. Ali. “Reading, Writing, and Learning Disorders in Dyslexic Patients in Pematang Siantar City”. Utopía Y Praxis Latinoamericana, Vol. 25, no. 1, May 2020, pp. 127-36, http://www.produccioncientifica.luz.edu.ve/index.php/utopia/article/view/31824.