1. T. T. Mackie and B. W. Hogwood (1985), p. 1. Dunleavy and Rhodes use the expression ‘core executive’, though this defines the area of interest more widely to cover, among others, finance ministries. See P. Dunleavy and R. A. W. Rhodes (1990).
2. G. T. Allison (1971), pp. 83 and 169. See also J. Pfeffer (1981), especially Ch. 5.
3. C. Hood (1986), Chs 2 and 3.
4. S. A. de Smith, 4th ed. (1981). P. Hennessey (1986), pp. 8-14. Cabinet Office (1992).
5. Hall, P., Land, H., Parker, R. and Webb, A. (1975), pp. 35-8.