Sources:

*OneWorldTree. Ancestry.com. John Sheffield to David Howe [database on-line]. Provo, Utah, U.S.: The Generations Network, Inc., 2005

*OneWorldTree. Ancestry.com. John Sheffield to Elizabeth Windsor [database on-line]. Provo, Utah, U.S.: The Generations Network, Inc., 2006

*Oxford Dictionary of National Biography. Oxforddnb.com.

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