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Marcelino Hermawan, Marcellino Aditya, and Winta T. Satwikasanti, “Perancangan APE bagi Siswa Penyandang Tunagrahita untuk Meningkatkan Kemampuan Berhitung Dasar, dengan Pendekatan Pembelajaran Manipulatif”, serenade 2021, vol. 3, no. 1, Aug. 2025.