(1999). Voluntary approaches for environmental policy: An assessment. OECD Publications Services.
芝加哥风格引文Voluntary Approaches for Environmental Policy: An Assessment. Paris, France: OECD Publications Services, 1999.
MLA引文Voluntary Approaches for Environmental Policy: An Assessment. OECD Publications Services, 1999.
警告:这些引文格式不一定是100%准确.