Urwellen, R. H. (2009). Oil spill costs and impacts. Nova Science Publishers, Inc..
芝加哥风格引文Urwellen, Robert H. Oil Spill Costs and Impacts. New York: Nova Science Publishers, Inc., 2009.
MLA引文Urwellen, Robert H. Oil Spill Costs and Impacts. Nova Science Publishers, Inc., 2009.
警告：这些引文格式不一定是100％准确.