(1914). Coal age. McGraw-Hill.
芝加哥风格引文Coal Age. New York: McGraw-Hill, 1914.
MLA引文Coal Age. McGraw-Hill, 1914.
警告：这些引文格式不一定是100％准确.
APA引文
(1914). Coal age. McGraw-Hill.
芝加哥风格引文Coal Age. New York: McGraw-Hill, 1914.
MLA引文Coal Age. McGraw-Hill, 1914.