1. African Research Bulletin, Economic Series: Private Car Imports Suspended , Oxford, England: African Research Limited, (1980 ), p.5401 .
2. African Research Bulletin, Economic Series: Incentives for Exporters , Oxford, England: African Research Limited, (1982 ), pp. 6074 -6075 .
3. African Research Bulletin, Economic Series: Imports Restricted , Oxford, England: African Research Limited, (1983 ), p.6344 .
4. African Research Bulletin, Economic Series: Bonuses and Surcharges , Oxford, England: African Research Limited, (1984 ), p.6844 .
5. African Research Bulletin, Economic Series: Social and Cultural Development , Oxford, England: African Research Limited, (1984 ), p.7232 .