SOMERVIL BARBARA. (2019). THE STORY BEHIND COAL (2012 Ed.). RAINTREE PUBLISHERS.
芝加哥风格引文SOMERVIL BARBARA. THE STORY BEHIND COAL. 2012 Ed. CHICAGO: RAINTREE PUBLISHERS, 2019.
MLA引文SOMERVIL BARBARA. THE STORY BEHIND COAL. 2012 Ed. RAINTREE PUBLISHERS, 2019.
警告：这些引文格式不一定是100％准确.