Editing Tillage (section)

===Bibliography===
* Cook, R.L., H.F. McColly, L.S. Robertson, and C.M. Hansen. 1958. Save Money – Water –  Soil with Minimum Tillage. Extension Bulletin 352. Cooperative Extension Service, Michigan State University, East Lansing. 
* Sprague, Milton A., and Glover B. Triplett. 1986. ''No-tillage and surface-tillage agriculture: the tillage revolution''. New York, Wiley. {{ISBN|978-0-471-88410-1}}
* Troeh, Frederick R., J. Arthur Hobbs, Roy L. Donahue. 1991. ''Soil and water conservation for productivity and environmental protection'', 2nd ed. Englewood Cliffs, N.J., Prentice-Hall. {{ISBN|978-0-13-096807-4}}
* Soil Science of America. 2009. Glossary of Soil Science Terms. [Online]. Available at https://www.soils.org/publications/soils-glossary (28 September 2009; verified 28 September 2009). Soil Science of America, Madison, WI.
* [http://www.sciencebuddies.org/science-fair-projects/project_ideas/EnvSci_p052.shtml No-Plow Farmers Save Our Soil]
* [http://knowledge.allianz.com/en/globalissues/safety_health/food_water/agriculture_sustainable_farming.html agriculture_sustainable_farming.html]
* [http://www.umequip.com/tillage/primary/zone-builder Manufacturer of Agricultural Zone Till Subsoiler with Photos] (umequip.com by Unverferth Equipment)