Hohmann, L. (2003). Beyond Software Architecture: Creating and Sustaining Winning Solutions. Addison-Wesley Professional. pp. 76–8. ISBN 9780132465946. 9780132465946
Sharma, D.P. (2008). Foundation of Operating Systems. Excel Books. pp. 10–11. ISBN 9788174466266. 9788174466266
Chauhan, S.; Saxena, A.; Gupta, K. (2006). Fundamentals of Computer. Firewall Media. p. 84. ISBN 9788170088547. 9788170088547
Hohmann, L. (2003). Beyond Software Architecture: Creating and Sustaining Winning Solutions. Addison-Wesley Professional. pp. 76–8. ISBN 9780132465946. 9780132465946
Pallatto, J. (12 October 2005). "Study Shows Enterprises Favor Concurrent-User Software Licenses". eWeek. QuinStreet, Inc. Retrieved 2 March 2019. https://www.eweek.com/it-management/study-shows-enterprises-favor-concurrent-user-software-licenses
Practising Law Institute (2006). Understanding the Intellectual Property License. Practising Law Institute. pp. 140–42.
Sommer, T. (May 2013). "Top 200 SAM Terms – A Glossary Of Software Asset Management Terms". OMTCO. Archived from the original on 10 August 2013. Retrieved 2 March 2019. https://web.archive.org/web/20130810111112/http://omtco.eu/references/sam/top-200-sam-terms-a-glossary-of-software-asset-management-terms/