1. Cleaner production: institutions promoting investment and financing, UNEP, April 2000.
2. Promoting cleaner production investments in developing countries: a status report on key issues and possible strategies;Van Berkel,1998
3. The World Bank pollution prevention and abatement manual,1998
4. Financing cleaner production: study on past investment practices. UNEP 2000.
5. Knowledge, attitudes and practices of Zimbabweans in relation to waste. ROSCAM, Zimbabwe; July 2000.