Yusuf, M. “Rancang Bangun Tombol Darurat Bagi Lansia Dan Penderita Cardiovascular Berbasis ESP8266 Dan Raspberry Pi”. Journal of Informatics and Communication Technology (JICT), vol. 2, no. 2, Dec. 2020, pp. 1-7, doi:10.52661/j_ict.v2i2.53.