Istiqomah, Aida, Dina Auliya, Muhammad Aslam, Nida Awalinda, and Nuriana (Nino Adhi). “Pembuktian Teori Perkembangan Kognitif Jean Piaget Pada Anak Tahap Operasi Konkret Terhadap Hukum Kekekalan Volume”. PRISMA, Prosiding Seminar Nasional Matematika 6 (February 28, 2023): 126-131. Accessed December 19, 2024. https://journal.unnes.ac.id/sju/prisma/article/view/66697.