Mohammad Nazri Rosli, et al. “IoT Based Security System for a One Bed Hospital Room”. Vol. 1 No. 1 (2019): Internet of Things: Tracking & Monitoring, vol. Vol. 1 No. 1, Penerbit UTHM, 2022, pp. 57-68, https://publisher.uthm.edu.my/omp/index.php/penerbituthm/catalog/book/466/chapter/28.