Organisation for Economic Co-operation and Development. (2020). The circular economy in Valladolid, Spain. OECD.
芝加哥风格引文Organisation for Economic Co-operation and Development. The Circular Economy in Valladolid, Spain. Paris: OECD, 2020.
MLA引文Organisation for Economic Co-operation and Development. The Circular Economy in Valladolid, Spain. OECD, 2020.
警告：这些引文格式不一定是100％准确.