Azizah EFN, Sofiana S, Syakh EF, Ali SL. APPLICATION OF DIFFERENTIAL REINFORCEMENT TECHNIQUE TO REDUCE LATE ARRIVAL BEHAVIOR OF STUDENTS IN CLASS IX SMP 61 SURABAYA. JKPP [Internet]. 2025 Sep. 17 [cited 2025 Oct. 8];3(1):48-63. Available from: https://altinriset.com/journal/index.php/jkpp/article/view/179