Cahyono, Cahyono, Dadang Mulyana, Lili Sukarliana, and Desi Puspitasari. 2022. “Analisis Implementasi Model Pembelajaran Problem Based Learning Dalam Menumbuhkan Keterampilan Mengemukakan Pendapat Pada Proses Pembelajaran : Analysis of the Problem Based Learning Models Implementation in Developing Express Opinion Skills on the Learning Process. ”. Jurnal Ilmiah Mimbar Demokrasi 21 (2):87-92. https://doi.org/10.21009/jimd.v21i2.25855.