Heryanto, D., N. Agusdianita, D. Lencana, and L. Zahrani. “The Need for Interactive PjBL E-Worksheets in Deep Learning of Flat Shapes Material for 4th Grade Elementary School”. TOFEDU: The Future of Education Journal, vol. 4, no. 9, Dec. 2025, pp. 5666-73, doi:10.61445/tofedu.v4i9.1328.