Rose, A. (2003). Kings in the North: The House of Percy in British history. Phoenix.
Lua i Stíl Chicago (17ú heag.)Rose, Alexander. Kings in the North: The House of Percy in British History. London: Phoenix, 2003.
Lua MLA (9ú heag.)Rose, Alexander. Kings in the North: The House of Percy in British History. Phoenix, 2003.
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