Valdes, A., Ramos, H., & Schaeffer, B. (1996). Surveillance of agricultural price and trade policies: A handbook for Ecuador. World Bank.
芝加哥风格引文Valdes, Alberto, Hugo Ramos, 与 Barry Schaeffer. Surveillance of Agricultural Price and Trade Policies: A Handbook for Ecuador. Washington, D.C: World Bank, 1996.
MLA引文Valdes, Alberto, et al. Surveillance of Agricultural Price and Trade Policies: A Handbook for Ecuador. World Bank, 1996.
警告：这些引文格式不一定是100％准确.