(July 2009). What is Sustainable Agriculture? (页面存档备份,存于互联网档案馆). United States Department of Agriculture, Alternative Farming Systems Information Center.
Encyclopædia Britannica's definition of Intensive Agriculture. (原始内容存档于2006-07-05). BBC School fact sheet on intensivefarming. (原始内容存档于2007-05-03). Lowder,