Valdes, A., Ramos, H., & Schaeffer, B. (1996). Surveillance of agricultural price and trade policies: A handbook for Ecuador. World Bank.
Citazione stile Chigago Style (17a edizione)Valdes, Alberto, Hugo Ramos, e Barry Schaeffer. Surveillance of Agricultural Price and Trade Policies: A Handbook for Ecuador. Washington, D.C: World Bank, 1996.
Citatione MLA (9a ed.)Valdes, Alberto, et al. Surveillance of Agricultural Price and Trade Policies: A Handbook for Ecuador. World Bank, 1996.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.