International Energy Agency. (2004). Energy policies of IEA countries: Portugal 2004 review. OECD/IEA.
芝加哥风格引文International Energy Agency. Energy Policies of IEA Countries: Portugal 2004 Review. Paris, Cedex, France: OECD/IEA, 2004.
MLA引文International Energy Agency. Energy Policies of IEA Countries: Portugal 2004 Review. OECD/IEA, 2004.
警告：这些引文格式不一定是100％准确.