Coffer, W. E. (1981). Where is the eagle? Van Nostrand Reinhold.
芝加哥风格引文Coffer, William E. Where Is the Eagle? New York [u.a.]: Van Nostrand Reinhold, 1981.
MLA引文Coffer, William E. Where Is the Eagle? Van Nostrand Reinhold, 1981.
警告：这些引文格式不一定是100％准确.