1. Bickers, Robert, “Purloined Letters: History and the Chinese Maritime Customs Service” Modern Asian Studies, Vol. 40, No. 3, 2006, pages 691–723.
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3. Boulger, Demetrious C., The Life of Gordon, 2 volumes, Fisher-Unwin, London, 1896 cited in Spence, Jonathan, To Change China: Western Advisers in China, Penguin, 2002 (reprint).
4. Bredon, Juliet, Sir Robert Hart: The Romance of a Great Career, Dutton, New York, 1909 cited in Spence, Jonathan, To Change China: Western Advisers in China, Penguin, 2002 (reprint).
5. Crook, David, From Hampton Heath to Tian’anmen—The autobiography of David Crook (online), 2009. http://www.davidcrook.net/simple/main.html .