1909
A.J. Finberg, A Complete Inventory of the Drawings of the Turner Bequest, London 1909, vol.II, p.926, as ‘Do.’ i.e. ‘Ditto’, ‘Castle on rock–“Mayer, built by Julius Caesar”’.
1991
Cecilia Powell, Turner’s Rivers of Europe: The Rhine, Meuse and Mosel, exhibition catalogue, Tate Gallery, London 1991, pp.53, note 32 [p.62], 150 no.83, Appendix, pp.220–4.
1995
Cecilia Powell, Turner in Germany, exhibition catalogue, Tate Gallery, London 1995, pp.63 note 15 [p.81], 142 no.63.
1995
Cecilia Powell and Pia Müller-Tamm, William Turner in Deutschland, exhibition catalogue, [Städtische] Kunsthalle Mannheim 1995, p.142 fig.63.1.