Oryza Tannar (2019) “Analysis Risk Management of Procurement System Goods/Services (Study Case in PT. Perusahaan Listrik Negara (PERSERO) of East Java Distribution, South Surabaya Service Area and Network”, Journal of Economics, Business, and Government Challenges, 2(01), pp. 12–21. doi: 10.33005/ebgc.v2i1.62.