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- [S142] Royal Ancestry: A Study in Colonial and Medieval Families by Douglas Richardson. Salt Lake City, 2013.
- [S699] The Visitations of the County of Devon, Comprising the Heralds' Visitations of 1531, 1564, & 1620, with additions by J. L. Vivian. Devon: 1895.
- [S145] Ancestral Roots of Certain American Colonists Who Came to America Before 1700 by Frederick Lewis Weis and Walter Lee Sheppard, Jr. 8th edition, William R. Beall & Kaleen E. Beall, eds. Baltimore: Genealogical Publishing Company, 2004, 2006, 2008.
- [S6502] A Genealogical and Heraldic History of the Peerage and Baronetage, the Privy Council, Knightage and Companionage by Bernard Burke and Ashworth P. Burke. 76th edition. New York: G. P. Putnam's Sons, 1914.
- [S786] Hardinge F. Giffard, "Giffard's Jump." Reports and Transactions of the Devonshire Association for the Advancement of Science, Literature, and Art, 34:648, 1902.
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