* Goodall, John, " Dover Castle and the Great Siege of 1216 ", Chateau Gaillard v. 19 ( 2000 ) ( the online version lacks the diagrams of the print version )
* Goodall, John, " Dover Castle and the Great Siege of 1216 ", Chateau Gaillard v. 19 ( 2000 ) ( the online version lacks the diagrams of the print version )
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