Sitepu, V.B. and Soma, A.M. 2025. Comparison of black scholes and garch models using collar strategy as a hedging efforts in the telecommunication industry (Telkomsel, XL, Indosat). Journal of Multidisciplinary Academic and Practice Studies. 3, 3 (Jul. 2025), 651–675. DOI:https://doi.org/10.35912/jomaps.v3i3.3209.