Frans Xaverius Ulu; Andy Usmina Wijaya. Action Against Assistance in the Abuse of Residence Permits for Foreign Nationals by the Class I Immigration Office TPI Tanjung Perak (Case Study of the Surabaya District Court Decision No. 4485 Pid.C 2021 PN Sby). JLPH 2025, 5, 1948-1956.