“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), pp. 195–244. doi:10.70526/apsrj.v1i1.22.