Khoiriyah, Khoiriyah. “Picture Exchange Communication System (PECS): A Strategy to Improve children’s Speaking Ability”. Journal of Early Childhood Care and Education 3, no. 2 (February 4, 2021): 111–123. Accessed November 24, 2024. http://journal2.uad.ac.id/index.php/jecce/article/view/2589.