1. International Organization for Standardization (ISO), BS en iso 9001:2008, 2008. Last accessed: January 2020.
2. A guide to the project management body of knowledge (PMBOK® guide)-fifth edition;Rose;Proj. Manag. J,2013
3. Managing Successful Projects with Prince2,2009
4. CMMI for Development, Version 1.3,2010
5. Cartlidge, A., Hanna, A., Rudd, C., Macfarlane, I., Windebank, J., & Rance, S. (2007). An Introductory Overview of ITIL v3: A high-level overview of the IT Infrastructure Library. version 1.0. EUA: itSM.