Dormant, Abeyant, Forfeited, and Extinct Peerages @ p. 201, Fitz-Alan, Earls of Arundel, Barons Maltravers
The cited information was published by Burke's Peerage, Ltd., London, England, 1883, held in
{R500171218} (Ref: p. 201, Fitz-Alan, Earls of Arundel, Barons Maltravers) The author/originator was Sir Bernard Burke.