Agung Raharjo M, Sabur F, Hidayat R. Design of a Global System for Mobile Communication Signal Blocking Tool at Vocational Higher Education. ajtk [Internet]. 2023 Dec. 31 [cited 2024 Nov. 22];6(2):120-3. Available from: https://jurnal.poltekbangmakassar.ac.id/index.php/airman/article/view/376