APA-viite (7. p.)
ebrary, Inc. (2010). The future of the natural gas market in South East Europe. World Bank.
Chicago-viite (17. p.)
ebrary, Inc. The Future of the Natural Gas Market in South East Europe. Washington, D.C.: World Bank, 2010.
MLA-viite (9. p.)
ebrary, Inc. The Future of the Natural Gas Market in South East Europe. World Bank, 2010.
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