Kurniasih, D, A Feryandi, L Nurmayanti, and P Usmany. 2021. “Application of Single Identification Number on an Identity Card (E-KTP) in the Era of the Industrial Revolution 4.0”. International Journal of Research and Applied Technology (INJURATECH) 1 (1), 35-42. https://doi.org/10.34010/injuratech.v1i1.5458.