Akbar, M. Fahri, et al. “Implementing an Android Facial-Biometric Attendance System in a Resource-Constrained School: Validity, Practicality, and Effectiveness Evidence”. Jurnal Pendidikan Teknologi Kejuruan, vol. 9, no. 1, Feb. 2026, pp. 21-46, https://doi.org/10.24036/jptk.v9i1.48623.