wijayanto, aditya, and F. Wibowo. “PENERAPAN EMERGENCY SYSTEM BERBASIS MOBILE (STUDY KASUS INSTITUT TEKNOLOGI TELKOM PURWOKERTO)”. Journal of Informatics Information System Software Engineering and Applications (INISTA), Vol. 1, no. 2, May 2019, pp. 1-8, doi:10.20895/inista.v1i2.29.