Apriyanto, A., M. Sholeh, and W. Setiawardani. “Management of Teacher Discipline Development Through a Web-Based QR Code Attendance System With WhatsApp E-Notifications at SMK (Vocational School) Nahdlatul Ulama (NU) Kaplongan Indramayu”. Journal of General Education and Humanities, vol. 4, no. 4, Nov. 2025, pp. 1949-62, doi:10.58421/gehu.v4i4.761.