Complete Peerage, Location: Mid-Continent Library, Independence @ 2nd ed., vol. XII, part 1, p. 503.
The cited information was published by St. Catherine Press, 29 Great Queen St, Kingsway, W.C., 1959 (Ref: 2nd ed., vol. XII, part 1, p. 503.) The author/originator was G.E. Cockayne.