Haaland, J. I. (1988). Modelling trade and trade policy. B. Blackwell.
芝加哥风格引文Haaland, Jan I. Modelling Trade and Trade Policy. Oxford, OX, UK ; New York, NY, USA: B. Blackwell, 1988.
MLA引文Haaland, Jan I. Modelling Trade and Trade Policy. B. Blackwell, 1988.
警告：这些引文格式不一定是100％准确.