fathan Hidayat, S. Nur, Moch Irwan Hermanto, Joko Haryatno, Muhamad Ikmal Wiawan, and Agung Muhammad Toha, “Designing a website-based extracurricular application using the waterfall method at Muhammadiyah Cibiuk High School”, TEKNU, vol. 8, no. 1, Aug. 2026.