Birdsall, S. S., & Florin, J. (1992). Outline of american geography: Regional landscapes of the united states (Fourth edition.). John Wiley.
芝加哥风格引文Birdsall, Stephen S., 与 John Florin. Outline of American Geography: Regional Landscapes of the United States. Fourth edition. New York: John Wiley, 1992.
MLA引文Birdsall, Stephen S., 与 John Florin. Outline of American Geography: Regional Landscapes of the United States. Fourth edition. John Wiley, 1992.
警告：这些引文格式不一定是100％准确.