Paul, E. C. (1974). The viability of Singapore: An aspect of modern political geography. University Microfilms International.
芝加哥风格引文Paul, Erik Charles. The Viability of Singapore: An Aspect of Modern Political Geography. Ann Arbor: University Microfilms International, 1974.
MLA引文Paul, Erik Charles. The Viability of Singapore: An Aspect of Modern Political Geography. University Microfilms International, 1974.
警告：这些引文格式不一定是100％准确.