1909
A.J. Finberg, A Complete Inventory of the Drawings of the Turner Bequest, London 1909, vol.I, p.173 LXIX 113 (as ‘Castle on hill. Study for “Dolbadarn.”‘ c.1800–2).
1963
Adrian Stokes, Painting and the Inner World, London 1963, pp.62–3.
1972
Gerald Wilkinson, Turner’s Early Sketchbooks: Drawings in England, Wales and Scotland from 1789 to 1802, London 1972, p.94 reproduced in colour.
1982
Jerrold Ziff, ‘Turner’s First Poetic Quotations: an Examination of Intentions’, Turner Studies, vol.2, no.1, Summer 1982, p.11 note 34.
1984
Martin Butlin and Evelyn Joll, The Paintings of J.M.W. Turner, revised ed., New Haven and London 1984, p.9 under no.12.