WRIGHLEY, G. Tropical agriculture#the development of production#Gordon Wrighley. Longman.
Čikaški stil citiranja (17. izdanje)WRIGHLEY, Gordon. Tropical Agriculture#the Development of Production#Gordon Wrighley. Longman.
MLA način citiranja (8. izdanje)WRIGHLEY, Gordon. Tropical Agriculture#the Development of Production#Gordon Wrighley. Longman.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.