International Energy Agency. (2019). Spot market and crude oil import costs: Oil product spot prices (Edition 2019). OECD Publishing. https://doi.org/10.1787/374ded4d-en
Chicago-Zitierstil (17. Ausg.)International Energy Agency. Spot Market and Crude Oil Import Costs: Oil Product Spot Prices (Edition 2019). Paris: OECD Publishing, 2019. https://doi.org/10.1787/374ded4d-en.
MLA-Zitierstil (9. Ausg.)International Energy Agency. Spot Market and Crude Oil Import Costs: Oil Product Spot Prices (Edition 2019). OECD Publishing, 2019. https://doi.org/10.1787/374ded4d-en.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.