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SARI, SUCI PERWITA, and EKO FEBRI SYAHPUTRA SIREGAR. 2020. “Pengaruh Model Abad 21 4Cs Dalam Meningkatkan Kemampuan Membuat Pertanyaan Tingkat Tinggi Mahasiswa Semester I PGSD FKIP UMSU Materi Gejala Alam TA. 2019/2020”. Jurnal Ilmiah Aquinas 3 (2):208-15. https://doi.org/10.54367/aquinas.v3i2.720.