International Monetary Fund. "Export and Import Price Index Manual: Theory and Practice." IMF eLibrary. IMF eLibrary. USA. 2009. Web. 23 May. 2013. <http://elibrary.imf.org/view/IMF069/02241-9781589067806/02241-9781589067806/02241-9781589067806.xml>.

International Monetary Fund (2009). Export and Import Price Index Manual: Theory and Practice. In IMF eLibrary, . USA. Retrieved 23 May. 2013, from http://elibrary.imf.org/view/IMF069/02241-9781589067806/02241-9781589067806/02241-9781589067806.xml

International Monetary Fund. "Export and Import Price Index Manual: Theory and Practice." In , IMF eLibrary. (USA, 2009). Retrieved 23 May. 2013, from http://elibrary.imf.org/view/IMF069/02241-9781589067806/02241-9781589067806/02241-9781589067806.xml