Chorley, R.J. editor, 1973: Directions in geography. London: Methuen.
2.
Johnston, R.J.1979: Geography and geographers. London: Edward Arnold.
3.
Lacey, A.R.1976: A dictionary of philosophy. London : Routledge and Kegan Paul.
4.
Mikesell, M.W.1975: The rise and decline of sequent occupance. In Lowenthal, D. and Bowden, M.J. editors, Geographies of the mind: essays in historical geosophy, New York: Oxford University Press.
5.
Pred, A.R.1979: The academic past through a time-geographic looking glass . Annals of the Association of American Geographers69, 175-80.
6.
Quinton, A.1977: Philosophy. In Bullock, A. and Stallybrass, O., editors, The Fontana dictionary of modern thought, London: Fontana/Collins.