JOENNA KASSIM and WIRAWATI NGUI (2025) “DEVELOPING SPEAKING SKILLS THROUGH FLIPPED CLASSROOM AT A SECONDARY SCHOOL IN SABAH”, MANU Jurnal Pusat Penataran Ilmu dan Bahasa (PPIB), 36(1), pp. 62–83. doi: 10.51200/manu.v36i1.5599.