ebrary, Inc, & Heckrath, G. (2005). Tools for assessing phosphorus loss from Nordic agriculture. Nordic Council of Ministers.
芝加哥风格引文ebrary, Inc, 与 Goswin Heckrath. Tools for Assessing Phosphorus Loss from Nordic Agriculture. Copenhagen: Nordic Council of Ministers, 2005.
MLA引文ebrary, Inc, 与 Goswin Heckrath. Tools for Assessing Phosphorus Loss from Nordic Agriculture. Nordic Council of Ministers, 2005.
警告：这些引文格式不一定是100％准确.