L., C., G. et al.(1997).Agricultural economics and agribusiness / Gail L. Cramer, Clarence W. Jensen, Douglas D. Southgate, Jr. .New York:John Wiley n Sons.
Gaya MLA
Cramer, Gail, L.. et al."Agricultural economics and agribusiness / Gail L. Cramer, Clarence W. Jensen, Douglas D. Southgate, Jr.".New York:John Wiley n Sons,1997.Textbook.