N. Fakhrudiyanto, “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”, APSRJ, vol. 1, no. 1, pp. 195-244, Jan. 2017.