Dotan Cohen. What is the GPL? 2007-1-31 Available at: http://what-is-what.com/what_is/gpl.html Accessed: 2013-12-9
What is the GPL? (2007-1-31) In website What-is-What. Retrieved 2013-12-9 from http://what-is-what.com/what_is/gpl.html
Dotan Cohen, "What is the GPL?" What-is-What http://what-is-what.com/what_is/gpl.html (accessed 2013-12-9)
Dotan Cohen. What is the GPL? [Internet]. What-is-What; 2007-1-31 [cited 2013-12-9]. Available from: http://what-is-what.com/what_is/gpl.html
Dotan Cohen, 'What is the GPL?', What-is-What, 2007-1-31, <http://what-is-what.com/what_is/gpl.html> [accessed 2013-12-9]
Dotan Cohen. "What is the GPL?" What-is-What, 2007-1-31. Web. 2013-12-9.
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