1. State-of-the-art in product-service systems
2. Goedkoop M, van Haler C, te Riele H, Rommers P. Product-service systems, ecological and economic basics. 1999, Report for Dutch Ministries of Environment (VROM) and Economic Affairs (EZ).
3. Draft Systems Engineering Standard 294, AFMC, MIL-STD 499B, Systems Engineering, 5/6/92.
4. UK MoD. What is through life capability management? AOF Acquisition Operating Framework (October 2008), The high level principles and information that guide how the UK MoD Defence Acquisition Community work, Version 2.0.6, available from http://www.aof.mod.uk/aofcontent/operational/business/capabilitymanagement/capabilitymanagement_whatis.htm (accessed 2 March 2009).