1. Beattie A. The History Of Money: From Barter To Banknotes [Internet]. 2015 [cited 2017 Nov 15]. Available from: https://www.investopedia.com/articles/07/roots_of_money.asp.
2. R. C. Economic history: When did globalisation start? | The Economist. Timekeeper [Internet]. 2013 [cited 2017 Nov 21]; Available from: http://www.economist.com/blogs/freeexchange/2013/09/economic-history-1.
3. Dervojeda K, Verzijl D, Nagtegaal F, Lengton M, Rouwmaat E. The sharing economy: Accessibility based business models for peer-to-peer markets. Bus Innov Obs [Internet]. 2013;20. Available from: http://ec.europa.eu/DocsRoom/documents/13413/attachments/2/translations/en/renditions/native.
4. Exploring the financial consequences of the servitization of manufacturing;Neely;Oper Manag Res.,2009
5. State-of-the-art in product-service systems;Baines;Proc Inst Mech Eng Part B J Eng Manuf.,2007