Aswina, Mayang Safitri, and Pratikto Herlan. “Economic Effectiveness of Tokens in Improving Eating Patterns in Mental Retardation Children”. Proceedings of The ICECRS 80 (July 3, 2020). Accessed November 25, 2024. https://icecrs.umsida.ac.id/index.php/icecrs/article/view/441.