(1) Satellite map images with missing or unclear data, Wikipedia http://en.wikipedia.org/wiki/List_of_places_blurred_out_on_Google_Maps
(2) Michel De Certeau. The Practice of Everyday Life. Berkeley: University of California Press, 1984. p. 97.
(3) Henri Lefebvre. The Production of Space. London: Blackwell, 1991. p. 86.
(4) Long, Richard. Statement carried on the official artist's website http://www.richardlong.org - accessed Feb 2009
(5) Michel De Certeau. The Practice of Everyday Life. Berkeley: University of California Press, 1984. p. 97.