1909
A.J. Finberg, A Complete Inventory of the Drawings of the Turner Bequest, London 1909, vol.I, p.452, CLVIII 52, as ‘Do.’ (i.e. ditto: ‘Study of sky’).
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Powell, ‘Turner on Classic Ground: His Visits to Central and Southern Italy and Related Paintings and Drawings’, unpublished Ph.D thesis, Courtauld Institute of Art, University of London 1984, p.493 note 55.
1987
John Gage, J.M.W. Turner: ‘A Wonderful Range of Mind’, New Haven and London 1987, p.247 note 74.
1998
James Hamilton, Turner and the Scientists, exhibition catalogue, Tate Gallery, London 1998, p.64.
2014
Ian Warrell, Turner’s Sketchbooks, London 2014, reproduced in colour p.103 as ‘Study of a Twilight Sky’.
2016
David Blayney Brown, J.M.W. Turner: The ‘Skies’ Sketchbook, London 2016, reproduced in colour p.[123].
2017
Alan Davis, ‘J.M.W. Turner: The ‘Skies’ Sketchbook with an introduction by David Blayney Brown’, Turner Society News, no.127, Spring 2017, pp.25–7.