10 OECD - Centre for Educational Research and Innovation 2007 Giving Knowledge for Free - The Emergence of Open Educational Resources OECD Publishing 149 05/2007 9789264032125 http://www.oecdbookshop.org/oecd/display.asp?SF1=DI&CID=&LANG=EN&ST1=5L4S6TNG3F9X