Cokayne, George Edward, <i>The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct, or Dormant</i> (London: St. Catherine Press, 1910.), 4:18-20, Los Angeles Public Library, 929.721 C682.
Richardson, Douglas, <i>Plantagenet Ancestry: A Study in Colonial and Medieval Families</i> (Baltimore: Genealogical Publishing Company, 2004.), pp. 251, 565, Family History Library, 942 D5rd.
Nichols, John Gough (Editor), "Early Pedigrees of the Parr Family," The Topographer and Genealogist vol. 3 (1858) (London: Society of Antiquaries, 1846-1858.), p. 354, Los Angeles Public Library.
Richardson, Douglas, <i>Magna Carta Ancestry: A Study in Colonial and Medieval Families</i> (Baltimore: Genealogical Publishing Co., 2005.), pp. 253, 644.
Cokayne, G., <i>CP</i>, 5:431.