1. ASHBY, A. (1981). Our Changing Diet–Lessons for Farmers. Paper presented at the Agricultural Education Association's Winter Conf., Imperial College, London. December 1981
2. Upgrading Wastes for Feeds and Food;ASHLEY,1983
3. BARBER, C. (1982). Domestic waste and leachate. Notes on Water Research. No. 31. May 1982
4. BARBER, C., MARIS, P.J. and JOHNSON, R.G., (1979). Behaviour of wastes in landfill sites: study of the leaching of a selected industrial waste in large scale test cells. Edmonton, North London. WLR Tech. Note No. 69. Department of the Environment
5. By-products and Wastes in Animal Feeding;BARBER,1980