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- [S142] Royal Ancestry: A Study in Colonial and Medieval Families by Douglas Richardson. Salt Lake City, 2013.
- [S2707] Brandon Fradd and Douglas Richardson, "The Royal Ancestry of Percival Lowell." The New England Historical and Genealogical Register 157:309, 2003.
- [S4299] The Peerage of Ireland, or, a Genealogical History of the Present Nobility of That Kingdom by John Lodge, rev. Mervyn Archdall. Volume 2. Dublin: James Moore, 1789.
- [S4300] A Genealogical History of the House of Yvery; in its Different Branches of Yvery, Luvel, Percival, and Gournay by James Anderson. 2 volumes. London: H. Woodfall, 1742.
- [S5882] Ancestral Lines from Maine to North Carolina by Carl Boyer III. Santa Clarita, California, 2015.
- [S50] Magna Carta Ancestry: A Study in Colonial and Medieval Families by Douglas Richardson. Second edition, 2011.
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