World Bank Group. (1999). Natural gas: Private sector participation and market development. World Bank Group.
Lua i Stíl Chicago (17ú heag.)World Bank Group. Natural Gas: Private Sector Participation and Market Development. Washington, D.C: World Bank Group, 1999.
Lua MLA (9ú heag.)World Bank Group. Natural Gas: Private Sector Participation and Market Development. World Bank Group, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.