Eckes, A. E. (2009). U.S. trade issues: A reference handbook. ABC-CLIO.
芝加哥风格引文Eckes, Alfred E. U.S. Trade Issues: A Reference Handbook. Santa Barbara, Calif.: ABC-CLIO, 2009.
MLA引文Eckes, Alfred E. U.S. Trade Issues: A Reference Handbook. ABC-CLIO, 2009.
警告：这些引文格式不一定是100％准确.