The World Bank [Electronic recourse]. - Regime of access : <http://www.worldbank.org/>[Electronic recourse]. - Regime of access : http://unctadstat.unctad.org/ReportFolders/reportFolders.aspx
Eurostat
[Electronic recourse]. - Regime of access :
http://epp.eurostat.ec.europa.eu/portal/page/portal/eurostat/home