Gregory, G. R. (1987). Resource economics for foresters. John Wiley and Sons.
芝加哥风格引文Gregory, G. Robinson. Resource Economics for Foresters. New York: John Wiley and Sons, 1987.
MLA引文Gregory, G. Robinson. Resource Economics for Foresters. John Wiley and Sons, 1987.
警告：这些引文格式不一定是100％准确.