1. Hubbard, L. J. , Brown, W. A. N. (1981). Multipliers from Regional Non-Survey Input-Output Tables for New Zealand, Agricultural Economics Research Unit, Research Report No. 117, University of Canterbury, New Zealand.
2. Hubbard, L. J. (1982). New Jobs in West Durham, Department of Agricultural Economics, Monograph No. 9, University of Newcastle-upon-Tyne.
3. Industry Department for Scotland, (1984). Scottish Input-Output Tables, 1-5.
4. Johns, P. M. , and Leat, P. M. K. (1986). An Approach to Regional Economic Modelling: The Case of Grampian, Economic Report, No. 144, North of Scotland College of Agriculture.