Chapman, Audrey R. (December 2002). „The Human Rights Implications of Intellectual Property Protection“. Journal of International Economic Law 5 (4): 861–882. Nuoroda tikrinta February 9, 2013 http://jiel.oxfordjournals.org/content/5/4/861.short
Lemley, M. A. 2005, ‘Property, Intellectual Property, and Free Riding‘, Texas Law Review, Vol. 83:1031, page 1033, footnote 4. http://www.texaslrev.com/
On patents – Daniel B. Ravicher (August 6, 2008). „Protecting Freedom In The Patent System: The Public Patent Foundation’s Mission and Activities“ http://www.youtube.com/watch?v=d0chez_Jf5A