Harvey, R. , Robinson, 2006. Herold, J. Christopher, , American Heritage Inc, 1963. McLynn, Frank, , Pimlico, 1998. . Richardson, Hubert N. B., , Cassel and Company LTD:London, 1920. Seward, Desmond, , Viking Penguin, 1986. Svensk uppslagsbok, Malmö 1939.