Ongkowidjojo , Yohana Agatha Christina, and Herlan Praktikto. “Effects of Positive Strengthening on the Crying, Anger, and Jumping Behavior of Autistic Children in Surabaya Private Schools”. Proceeding of The ICECRS 80 (June 19, 2020). Accessed May 17, 2021. https://press.umsida.ac.id/index.php/icecrs/article/view/439.