1. Bawden R J (1991) Systems thinking and practice in agriculture. J. Dairy Sci. 74:2362–2373.
2. Bawden R J, Macadam R D, Packham R J, Valentine I (1984) Systems thinking and practice in the education of agriculturalists. Agric. Syst. 13:205–225.
3. Caldwell J (1987) An overview of farming systems research and development: Origins, applications, and issues. Pages 165–178 in Gittinger J, Leslie J, Hoisington C (Eds.) Food policy. Johns Hopkins Press, Baltimore, MD, USA.
4. Chambers R (1992) Rural appraisal: Rapid, relaxed, and participatory. Discussion Paper No. 311, Institute of Development Studies, University of Sussex, Brighton, UK. 90 p.
5. Checkland P (1981) Systems thinking, systems practice. John Wiley and Sons, New York, USA. 319 p.