1. Brotton, J. 2012. A history of the world in twelve maps. London: Allan Lane.
2. Cutting, J. 2003. “Reconceiving perceptual space”. In Looking into pictures: An interdisciplinary approach to pictorial space, eds. H. Hecht, R. Schwartz, M. Atherton, 215–238. (Bradford Books).
3. Design Museum. 2013. “Jock Kinneir + Margaret Calvert”, http://designmuseum.org/design/jock-kinneir-margaret-calvert .
4. Dubery, F., and J. Willats. 1972. Drawing systems. Worthing: Littlehampton Book Services.
5. Dunbar, R. 2010. How many friends does one person need?: Dunbar's number and other evolutionary quirks. Mass.: Cambridge Harvard University Press.