Peningkatan Hasil Belajar Operasi Penjumlahan Sifat Komutatif melalui Media Flashcard. Jurnal Penelitian Pendidikan Indonesia, [S. l.], v. 2, n. 1, p. 38–47, 2025. Disponível em: http://ejournal.intelektualedu.com/index.php/JPPI/article/view/62.. Acesso em: 9 oct. 2025.