Sindi Sri Deviana Manalu, Jonny Siagian, and Ganda T. Hutapea, “The Influence Of Profitability Rasio On Stock Performance With Return Market Control Variabel In The Telecomunication Sub-Sector Listed On The Indonesia Stock Exchange Before, During and After Covid 19 ”, Fundamental; Management;, vol. 9, no. 2, pp. 1 - 25, Oct. 2024.