1. Council for Environmental Quality. 1982. The Global 2000 Report to the President. Pengu in Books.
2. Easter, J.M. 1982. Composting silos in Eurpoe. Biocycle May/June 18–21.
3. Evelyn. 1693. Quoted in The Rodale Guide to Composting. Rodale
4. Press. Emmaus, Pen. 1978.
5. FAO. 1977. Soils Bulletin No. 40: China: Recycling of organic wastes in agriculture. 107.