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M. Hechter, Internal Colonialism: The Celtic Fringe in British National Development, with a new introduction and a new appendix by the author. New Brunswick NJ and London: Transaction Publishers, 1999. ISBN 0–7685–0475–1.
G.H. Herb and D.H. Kaplan (eds.), Nested Identities: Nationalism, Territory, and Scale. Lanham MD and Oxford: Rowman and Littlefield, 1999. ISBN 0–8476–8467–9.