Dunbar, G. S. (1991). Modern geography: An encyclopedic survey. Garland.
芝加哥风格引文Dunbar, Gary S. Modern Geography: An Encyclopedic Survey. New York: Garland, 1991.
MLA引文Dunbar, Gary S. Modern Geography: An Encyclopedic Survey. Garland, 1991.
警告：这些引文格式不一定是100％准确.