“Safety Standards in Management and Engineering Policies at the Sidoarjo Transportation Agency: Standart Keselamatan dalam kebijakan Manajemen dan Rekayasa di Dishub Sidoarjo”, IJPPR, vol. 9, p. 10.21070/ijppr.v9i0.1158, Jan. 2020, doi: 10.21070/ijppr.v9i0.1158.