International Energy Agency. (2015). OECD - Natural gas supply and consumption (Edition 2015). OECD Publishing. https://doi.org/10.1787/d33718cf-en
Chicago-Zitierstil (17. Ausg.)International Energy Agency. OECD - Natural Gas Supply and Consumption (Edition 2015). Paris: OECD Publishing, 2015. https://doi.org/10.1787/d33718cf-en.
MLA-Zitierstil (9. Ausg.)International Energy Agency. OECD - Natural Gas Supply and Consumption (Edition 2015). OECD Publishing, 2015. https://doi.org/10.1787/d33718cf-en.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.