APA-viite (7. p.)
Ikerd, J. E. (2008). Crisis and opportunity: Sustainability in American agriculture. University of Nebraska Press.
Chicago-viite (17. p.)
Ikerd, John E. Crisis and Opportunity: Sustainability in American Agriculture. Lincoln: University of Nebraska Press, 2008.
MLA-viite (9. p.)
Ikerd, John E. Crisis and Opportunity: Sustainability in American Agriculture. University of Nebraska Press, 2008.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.