APA
Valdes A., Schaeffer B., . (1996). Surveillance of agricultural price and trade policies. Washington, D.C: World Bank.
Chicago
Valdes Alberto, Schaeffer Barry, . 1996. Surveillance of agricultural price and trade policies. Washington, D.C: World Bank.
Harvard
Valdes A., Schaeffer B., . (1996). Surveillance of agricultural price and trade policies. Washington, D.C: World Bank.
MLA
Valdes Alberto, Schaeffer Barry, . Surveillance of agricultural price and trade policies. Washington, D.C: World Bank. 1996.