Sheria
{{cite journal |last=Coase |first=Ronald H. |authorlink=Ronald H. Coase |year=1960 |month=Oktoba |title=The Problem of Social Cost (this online version excludes some parts) |journal=Journal of Law and Economics |volume=3 |pages=1–44 |url=http://www.sfu.ca/~allen/CoaseJLE1960.pdf The Problem of Social Cost |accessdate=2007-02-10 |doi=10.1086/466560 |archive-date=2005-03-31 |archive-url=https://web.archive.org/web/20050331232727/http://www.sfu.ca/~allen/CoaseJLE1960.pdf |dead-url=yes }}