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Sprigg, R. K. (1974) 'The London-school 'systemic value' concept, and hierarchical versus relational analysis.' In: Heilmann, Luigi, (ed.), Proceedings of the Eleventh International Congress of Linguists, Bologna-Florence 1972. Volume 1. Bologna: il Mulino, pp. 667-671.
Brenner, Louis and Cohen, Ronald (1974) 'Bornu in the Nineteenth Century.' In: Ajayi, J. F. Ade and Crowder, Michael, (eds.), History of West Africa, Vol. II. London: Longmans, pp. 93-128.