1909
A.J. Finberg, A Complete Inventory of the Drawings of the Turner Bequest, London 1909, vol.II, p.723, CCXXXVI 6, as ‘Do.’ (i.e. ditto: ‘Town on hill’) and (as ‘6a’) ‘“Ronciglione,” and “Mt. Rosa.”’.
1984
Cecilia Powell, ‘Turner on Classic Ground: His Visits to Central and Southern Italy and Related Paintings and Drawings’, unpublished Ph.D thesis, Courtauld Institute of Art, University of London 1984, p.435.
1987
Cecilia Powell, Turner in the South: Rome, Naples, Florence, New Haven and London 1987, pp.159, 207 note 115.