Survey of London: Volume 14, St Margaret, Westminster, Part III: Whitehall II. Originally published by London County Council, London, 1931.
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'Plate 112: Nos. 10, 11, and 12, Downing Street, plan of ground floor', in Survey of London: Volume 14, St Margaret, Westminster, Part III: Whitehall II, (London, 1931) pp. 112. British History Online https://www.british-history.ac.uk/survey-london/vol14/pt3/plate-112 [accessed 26 April 2024]