1. S. Sreekanth, M. Sandeep, N. Santhosh, M.V. Devaraja and J.B. Kalaiah, "Design and Prototype Development of OTP based advanced digital Locking system", International Research Journal of Modernization in Engineering Technology and Science, vol. 03, no. 07, July 2021.
2. Chaitanya Rane, “Password Based Door Locking System Using GSM”, International Journal of Engineering Trends and Applications (IJETA), Volume 2 Issue 4, July-Aug 2015.
3. K. M. Pooja, K. G. Chandrakala, M. A. Nikhitha and P. N. Anushree, "Finger print based bank locker security system", Int. J. Eng. Res. Technol. (IJERT)NCESC, vol. 6, no. 13, pp. 1-5, 2018.
4. https://wiki.eprolabs.com/index.php?title=Bluetooth_Module_HC-05.
5. P. Deeksha, M.K. Mangala Gowri, R. Sateesh, M. Yashaswini and V. Ashika, "B. OTP Based Locking System using IOT", International Journal of Research Publication and Reviews, no. 2, pp. 352-356, 2021.