Cita APA (7th ed.)
Penson, J. B. (2015). Introduction to agricultural economics (6th ed.). Pearson.
Cita Chicago (17th ed.)
Penson, John B. Introduction to Agricultural Economics. 6th ed. Boston: Pearson, 2015.
Cita MLA (9th ed.)
Penson, John B. Introduction to Agricultural Economics. 6th ed. Pearson, 2015.
Atenció: Aquestes cites poden no estar 100% correctes.