, Luluk Hidayati1, Nanik Yuliati1*, Suhartiningsih. “The Development of Pop-Up Story Book for Improving Language Ability”. International Journal of Social Sciences and Humanities Invention 4, no. 8 (August 9, 2017): 3750–3755. Accessed April 20, 2024. https://valleyinternational.net/index.php/theijsshi/article/view/835.