Survey of London: Volumes 29 and 30, St James Westminster, Part 1. Originally published by London County Council, London, 1960.
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'Plate 171: Nos. 20–21 St. James's Square, front', in Survey of London: Volumes 29 and 30, St James Westminster, Part 1, ed. F H W Sheppard (London, 1960), British History Online https://prod.british-history.ac.uk/survey-london/vols29-30/pt1/plate-171 [accessed 16 April 2025].
'Plate 171: Nos. 20–21 St. James's Square, front', in Survey of London: Volumes 29 and 30, St James Westminster, Part 1. Edited by F H W Sheppard (London, 1960), British History Online, accessed April 16, 2025, https://prod.british-history.ac.uk/survey-london/vols29-30/pt1/plate-171.
"Plate 171: Nos. 20–21 St. James's Square, front". Survey of London: Volumes 29 and 30, St James Westminster, Part 1. Ed. F H W Sheppard (London, 1960), British History Online. Web. 16 April 2025. https://prod.british-history.ac.uk/survey-london/vols29-30/pt1/plate-171.
Nos. 20–21 St. James's Square, 1936.

Nos. 20–21 St. James's Square, front
Messrs. Mewès and Davis, architects: incorporating (right) three bays of 1771–5, Robert Adam, architect (pp. 164, 174)