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Babullah R. Teori Perkembangan Kognitif Jean Piaget dan Penerapannya dalam Pembelajaran: Jean Piaget’s Theory of Cognitive Development and Its Application in Learning. Epistemic [Internet]. 2022 May 31 [cited 2026 Jan. 17];1(2):131-52. Available from: https://journal.pegiatliterasi.or.id/index.php/epistemic/article/view/10