Safira, Nurlianti, Eva Meizara Puspita Dewi, and Harlina Hamid. 2021. “EFEKTIVITAS PENERAPAN PICTURE EXCHANGE COMMUNICATION SYSTEM (PECS) TERHADAP KEMAMPUAN BERBICARA EKSPRESIF PADA ANAK DOWN SYNDROME”. Al Asma : Journal of Islamic Education 3 (1), 50-63. https://doi.org/10.24252/asma.v3i1.21072.