A Guide Through the District of the Lakes in the North of England, with a Description of the Scenery, &c. For the Use of Tourists and Residents. Fifth Edition, with Considerable Additions. By William Wordsworth.
Cumberland and Westmorland Antiquaries and Archaeological Society. Extra Series: Vol. XIII. The Castles and Fortified Towers of Cumberland, Westmorland, and Lancashire North-of-the-Sands, Together with a Brief Historical Account of Border Warfar. By John F. Curwen, F. S. A., F. R. I. B. A.
A History of Appleby: County Town of Westmorland, by Martin W. Holdgate, M.A., Ph.D. Fellow of Queens' College, Cambridge
The Illustrated Wordsworth's Guide to the Lakes. Edited by Peter Bicknell. Foreword by Alan G. Hill.