Bauer, B. (2009). Benefits of green public procurement. Nordic Council of Ministers.
芝加哥风格引文Bauer, Bjorn. Benefits of Green Public Procurement. Copenhagen: Nordic Council of Ministers, 2009.
MLA引文Bauer, Bjorn. Benefits of Green Public Procurement. Nordic Council of Ministers, 2009.
警告：这些引文格式不一定是100％准确.