References
- Lynch , K. 1960 . The Image of the City , 4 Cambridge, Mass. : The M.I.T. Press .
- Norberg-Schulz , C. 1971 . Existence, Space and Architecture , 17 New York : Praeger .
- Piaget , J. 1963 . The Child's Conception of Space , 451 – 460 . London : Routledge and Kegan Paul .