“Peran Unit Dikyasa Satuan Lalu Lintas Polres Purworejo Dalam Menekan Angka Kecelakaan Lalu Lintas: The Role of Dikyasa Traffic Unit Police of Purworejo Regional Police in Suppressing Traffic Accident Rates”. 2017. Advances in Police Science Research Journal 1 (1): 195-244. https://doi.org/10.70526/apsrj.v1i1.22.