ISBN 978-0-520-06266-5. Richardson, Douglas. Magna Carta Ancestry: A Study in Colonial and Medieval Families. Utah: Douglas Richardson. 2011. ISBN 978-1-4610-4520-5
Everingham, Kimball G. , 编. Magna Carta Ancestry: A Study in Colonial and Medieval Families II 2nd. Salt Lake City, Utah, USA. 2011. ISBN 978-1449966386