Gultom, M. “Existence of Justice Collaborator in Criminal Action of Corruption: Decree Number 84 / Pid.Sus.TPK / 2018 / Pn. Medan, Indonesia”. The International Journal of Humanities & Social Studies, vol. 7, no. 2, Feb. 2019, doi:10.24940/theijhss/2019/v7/i2/HS1902-017.