www.nal.usda.gov/afsic

www.fao.org/farmingsystems

www.ncsu.edu/organic_farming_systems

www.arserrc.gov/beckley/AFSRC.htm

www.afsa.asn.au

www.idrc.ca/acb/showdetl.cfm

www.es.une.edu.au/c-sfs/

www.dpw.wageningen-ur.nl/biob/

www.cefs.ncsu.edu/

www.attra.org/attra-pub/perma.html

www.agric.nsw.gov.au/reader/farming-systems-planning

www.adas.co.uk/crops/sustainable.html

www.grdc.com.au/about/ar2002/app_SFS.htm

www.aciar.gov.au/web.nsf/doc/ACIA-5YWVBU