Valdes, A., & Schaeffer, B. (1996). Surveillance of agricultural price and trade policies: A handbook for Paraguay. World Bank.
Čikaški stil citiranja (17. izdanje)Valdes, Alberto, i Barry Schaeffer. Surveillance of Agricultural Price and Trade Policies: A Handbook for Paraguay. Washington, D.C: World Bank, 1996.
MLA način citiranja (9. izdanje)Valdes, Alberto, i Barry Schaeffer. Surveillance of Agricultural Price and Trade Policies: A Handbook for Paraguay. World Bank, 1996.
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