OKTAVIANA, D.; ZISCA DIANA, P. Development of Android-Based Gamification Media Design for Personal Letters and Formal Letters Material in Grade VII. International Proceedings of Nusantara Raya , [S. l.], v. 2, n. 1, p. 122–133, 2023. Disponível em: https://proceedings.uinsaizu.ac.id/index.php/nuraicon/article/view/391. Acesso em: 16 may. 2024.