References
- Ashton , G . 2009 . “ Nobel economics: The relevance of Elinor Ostrom's win ” . In South African Civil Society Information Service www.sacsis.org.za/site/article/371.1 Accessed 28 October 2009
- Hardin , G . 1968 . The tragedy of the commons . Science , 162 : 1243 – 8 .