Dotan Cohen. What is an Operating System? 2007-12-9 Available at: http://what-is-what.com/what_is/operating_system.html Accessed: 2013-5-22
What is an Operating System? (2007-12-9) In website What-is-What. Retrieved 2013-5-22 from http://what-is-what.com/what_is/operating_system.html
Dotan Cohen, "What is an Operating System?" What-is-What http://what-is-what.com/what_is/operating_system.html (accessed 2013-5-22)
Dotan Cohen. What is an Operating System? [Internet]. What-is-What; 2007-12-9 [cited 2013-5-22]. Available from: http://what-is-what.com/what_is/operating_system.html
Dotan Cohen, 'What is an Operating System?', What-is-What, 2007-12-9, <http://what-is-what.com/what_is/operating_system.html> [accessed 2013-5-22]
Dotan Cohen. "What is an Operating System?" What-is-What, 2007-12-9. Web. 2013-5-22.
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