Agustin, Amanda Tri, et al. “Development of an Education for Sustainable Development (ESD)-Based Digital Flipbook to Improve Sustainability Literacy Among Fifth-Grade Elementary School Students”. EDUJAVARE: International Journal of Educational Research, vol. 4, no. 02, Sept. 2026, pp. 1864-72, https://edujavare.com/index.php/EDUJAVARE/article/view/2024.