1. Handling Geographic Information. Report of the Committee of Enquiry Chaired by Lord Chorley;Department of the Environment,1987
2. Managing our Land Information Resources;US Department of the Interior,1989
3. National Transfer Format Glossary of Terms;NTF,1987
4. IT — the present state of the art in spatial data management;McLaren,1990
5. A cost-benefit study of a LIS — methodology and result;Bernhardsen,1986