Worrall, L. (1990). Geographic information systems: Developments and applications. Belhaven Press.
芝加哥风格引文Worrall, Les. Geographic Information Systems: Developments and Applications. London ; New York: Belhaven Press, 1990.
MLA引文Worrall, Les. Geographic Information Systems: Developments and Applications. Belhaven Press, 1990.
警告：这些引文格式不一定是100％准确.
