Dormant, Abeyant, Forfeited, and Extinct Peerages @ p. 198, Ferrers, Barons Ferrers, of Groby, co. Leicester
The cited information was published by Burke's Peerage, Ltd., London, England, 1883, held in
{R500171144} (Ref: p. 198, Ferrers, Barons Ferrers, of Groby, co. Leicester) The author/originator was Sir Bernard Burke.