Drummond, H. E. Agricultural Economics: Pearson New International Edition (3.). Pearson Education UK.
Čikaški stil citiranja (17. izdanje)Drummond, H. Evan;Goodwin. Agricultural Economics: Pearson New International Edition. 3. Pearson Education UK.
MLA način citiranja (8. izdanje)Drummond, H. Evan;Goodwin. Agricultural Economics: Pearson New International Edition. 3. Pearson Education UK.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.