Yusuf, Ah., Khoridatul Bahiyah, and Yustina Barek Ola. 2017. “Group Activity Therapy (Gat) Socialization Session 6 Increase Socialization Ability on Child of Mental Retardation”. Jurnal Ners 3 (2):115-20. https://doi.org/10.20473/jn.v3i2.4992.