Silitubun, Evaristus, et al. “The Effectiveness of Case-Based Learning to Improve the Collaboration and Communication Skills of Early Childhood Education Students”. Jurnal Obsesi : Jurnal Pendidikan Anak Usia Dini, vol. 8, no. 6, Nov. 2024, pp. 1385-94, doi:10.31004/obsesi.v8i6.6233.