Richardson, Douglas (2011). Everingham, Kimball G. (ed.). Magna Carta Ancestry: A Study in Colonial and Medieval Families. Vol. I (2nd ed.). Salt Lake City. ISBN978-1449966379.{{cite book}}: CS1 maint: location missing publisher (link)
Richardson, Douglas (2011). Everingham, Kimball G. (ed.). Magna Carta Ancestry: A Study in Colonial and Medieval Families. Vol. II (2nd ed.). Salt Lake City. ISBN978-1449966386.{{cite book}}: CS1 maint: location missing publisher (link)
Douglas Richardson. Royal Ancestry: A Study in Colonial and Medieval Families, 5 vols, ed. Kimball G. Everingham (Salt Lake City: the author, 2013), Vol. II, pp. 632-633, FITZHUGH 15