Lenina Olin, Oscarius Yudhi Ari Wijaya, Novi Indah Earlyanti, and Elvianus Laoli, “Public Service Quality: A Study on the Integrated Police Service Center (SPKT) at Polres Metro Jakarta Pusat (SERVQUAL)”, al. kharaj. j. islam. econ. bus., vol. 8, no. 2, Jun. 2026.