Siregar, Firman. “Pengantar Filsafat: By K. Bertens, Johanis Ohoitimur, Dan Mikhael Dua”. Indonesian Journal of Theology 6, no. 1 (July 30, 2018): 110-113. Accessed November 28, 2023. https://indotheologyjournal.org/index.php/home/article/view/21.