Novitasari, A.; Syachruroji, A.; Andriana, E. Optimization of The Understanding by Design (Ubd) Curriculum Approach in 21st Century Learning at SDIT Citra Bangsa: Penelitan Kulitatif Di SDIT Citra Bangsa. Jur. Gen. Pend. Dasar 2025, 10, 368-378.