Dokumentuaren aipamena

APA (7th ed.) Zitazioa
Penson, J. B. (2015). Introduction to agricultural economics (6th ed.). Pearson.
Chicago Style (17th ed.) Zitazioa
Penson, John B. Introduction to Agricultural Economics. 6th ed. Boston: Pearson, 2015.
MLA (9th ed.) Zitazioa
Penson, John B. Introduction to Agricultural Economics. 6th ed. Pearson, 2015.
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