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Gambar 3. singapura result 4d 1 Alur Model Pengembangan 4D Thiagarajan 3Thiagarajan, S. kelas 4d et al,, Instructional Development for Training Teacher of Exceptional Children (Bloomington Indiana: Indiana University, 1974), 5 4Triyanto, Mendesain Model Pembelajaran Inovatif-Progresif, (Jakarta: Kencana, 2010), 189