1. CGIAR, 2001. Will Agriculture Fall Victim to AIDS? 4 pages in Future Harvest, November 14, CGIAR Website.
2. North America;Cohen,2001
3. Cole, C.V., 1996. Agricultural Options for Mitigation of GHG emissions. In Climate Change 1995, Second Assessment Report. Cambridge University Press Publ. Chapter 23: pp. 745–771.
4. Global estimates of potential mitigation of greenhouse gas emissions by agriculture;Cole;Nutr. Cycl. Agroecosys.,1997
5. The impact of farm machinery management on greenhouse gas emissions from Canadian agriculture;Dyer;Sustain. Agr.,2003