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FRISNOIRY, Suci, SIREGAR, Tiur Malasari and MANURUNG, Sri Lestari. Mathematics Book Innovation Based on Digital Literature. Journal of Education, Health and Sport. Online. 1 September 2022. Vol. 12, no. 9, pp. 288-296. [Accessed 23 November 2024]. DOI 10.12775/JEHS.2022.12.09.033.