| This article is substantially duplicated by a piece in an external publication. Please do not flag this article as a copyright violation of the following sources: - Surhone, L. M., Tennoe, M. T., & Henssonow, S. F. (2010), Open Journal Systems: GNU general public license, Public knowledge project, Open access (publishing), Betascript Publishing
{{citation}} : CS1 maint: multiple names: authors list (link) - Miller, F. P., Vandome, A. F., & McBrewster, J. (2009), Copyleft: Word play, copyright, license, computer software, music, art, derivative work, GNU general public license, Creative Commons, public domain, gratis versus libre, open source, source code, Alphascript Publishing
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