D. R. Purba, E. M. Sianipar, R. P. Hasibuan, and M. Harianja, “Oikumenitas dan Solidaritas Ciptaan Allah menurut Dokumen Teologi Gereja HKBP [Ecumenism and Solidarity of God’s Creation According to the HKBP Church Theological Document]”, DILIGENTIA, vol. 6, no. 2, pp. 173–188, May 2024.