Cramer, G. L., & Jensen, C. W. (1997). Agricultural economics and agribusiness (6th. ed.). john wiley & sons, inc.
Παραπομπή σε μορφή Chicago (17η εκδ.)Cramer, Gail L., και Clarence W. Jensen. Agricultural Economics and Agribusiness. 6th. ed. New York: john wiley & sons, inc, 1997.
Παραπομπή σε μορφή MLA (9th εκδ.)Cramer, Gail L., και Clarence W. Jensen. Agricultural Economics and Agribusiness. 6th. ed. john wiley & sons, inc, 1997.