Sianipar, Rimma. “Combination of Project-Based Learning and Flipped Classroom (PjBL-FC) Models on Student Learning Achievement: Meta-Analysis Study”. International Journal Of Education And Social Research (IJESR), vol. 3, no. 2, May 2025, pp. 18-25, https://doi.org/10.62017/ijesr.v3i2.86.