1. Norman Ellison, Northwards with Nomad, illus. by C. F. Tunnicliffe (London: London University Press, 1951), p. 44.
2. Geoffrey Trease, Mystery on the Moor (London: A & C Black, 1937), pp. 56, 54, 49.
3. Arthur Ransome, Swallows and Amazons (1930; London: Jonathan Cape, 2007), pp. 25–34.
4. Margaret Lowenfeld, Play in Childhood (London: Victor Gollancz, 1935), p. 188.
5. Garry Hogg, Explorers Awheel (1938; London: Thomas Nelson, 1946), p. 31.