Budiarto, Lulus, Muhammad Akhyar, and Djono. “The Urgency of Prototype Curriculum Based E-Book for Mathematics Learning for Vocational School Students”. Journal of Education Technology 6, no. 4 (December 22, 2022): 755–764. Accessed May 7, 2024. https://ejournal.undiksha.ac.id/index.php/JET/article/view/53286.