^Philip Bounds, Orwell and Marxism: the political and cultural thinking of George Orwell. London: I.B. Tauris, 2009. ISBN9781845118075 (p. 204)
^"...the development of the Mass-Observation movement began with an informal group of friends and colleagues who met frequently in Blackheath at the London home of Charles Madge, Surrealist poet, journalist and soon-to-be sociologist." Natalya Lusty; Helen Groth (eds.) Dreams and modernity: a cultural history. London: Routledge, 2013. ISBN9780415606943 (p. 151).