Azzahra, Taskiyatun Nafs. “Development of Concrete Learning Media ‘Letter Roulette’ to Improve Early Reading Skills of Grade 1 Elementary School Students”. Global Journal of Learning Innovation and Educational Research (GJLIER), vol. 1, no. 1, Dec. 2025, pp. 19-26, https://msg-journal.com/index.php/gjlier/article/view/1.