Barbier, E. B. (1987). Cash crops, food crops and agricultural sustainability.
芝加哥风格引文Barbier, Edward B. Cash Crops, Food Crops and Agricultural Sustainability. 1987.
MLA引文Barbier, Edward B. Cash Crops, Food Crops and Agricultural Sustainability. 1987.
警告：这些引文格式不一定是100％准确.