World Bank Group. (1999). Natural gas: Private sector participation and market development. World Bank Group.
Citazione stile Chigago Style (17a edizione)World Bank Group. Natural Gas: Private Sector Participation and Market Development. Washington, D.C: World Bank Group, 1999.
Citatione MLA (9a ed.)World Bank Group. Natural Gas: Private Sector Participation and Market Development. World Bank Group, 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.