Mahendran P, NaveenKumar K, Prasanth G, Soundharya M S, and Vidhyashree S. “Implementation of Students Attendance Monitoring System Using RFID and GSM”. International Journal of Intellectual Advancements and Research in Engineering Computations, vol. 7, no. 1, Mar. 2019, pp. 1520-9, https://ijiarec.com/ijiarec/article/view/1170.