Goodlad, G. (2007). Oliver Cromwell. Humanities-Ebooks.
芝加哥风格引文Goodlad, Graham. Oliver Cromwell. Tirril [England]: Humanities-Ebooks, 2007.
MLA引文Goodlad, Graham. Oliver Cromwell. Humanities-Ebooks, 2007.
警告：这些引文格式不一定是100％准确.
APA引文