The Oxford Dictionary of National Biography has got an excellent article on the Shelton, there are articles on the Shelton women on Kate Emerson's Tudor women website - http://www.kateemersonhistoricals.com/TudorWomenIndex.htm and there's an article on Madge at https://www.theanneboleynfiles.com/17205/lady-margaret-shelton-or-pretty-madge/
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