R. Sirait, M. Pardede, E. Hutajulu, J. Junaidi, S. C. Y. Pardede, and A. Pakpahan, “Implementation of PZEM-004T and LoRa for Internet of Things–Based Monitoring of Power Supply Sources in Laboratory Building”, Mandiri, vol. 14, no. 2, pp. 223–235, Oct. 2025.