Megasari M, Riyanto agus. GEOMETRIC PUZZLE AND ART THERAPY (PLATE ART COLLAGE) TO IMPROVE CONCENTRATION AND SOCIAL INTERACTION OF MENTALLY RETARDED CHILDREN AT BC YATIRA SPECIAL SCHOOL. jkkes [Internet]. 2024Jun.12 [cited 2024Jul.7];19(1):1-8. Available from: http://ejournal.stikesjayc.id/index.php/litkartika/article/view/289