Roosmawarni, A., H. Sa’diyah, and K. Eferyn. “Companies Value of Indonesia Telecommunications Sector And Influencing Factors”. The Journal of Management, Digital Business, and Entrepreneurship, vol. 1, no. 02, June 2023, pp. 111-20, doi:10.58857/JMDBE.2023.v01.i02.p05.