Silk, J. (1979). Statistical concepts in geography. Allen and Unwin.
芝加哥风格引文Silk, John. Statistical Concepts in Geography. London ; Boston: Allen and Unwin, 1979.
MLA引文Silk, John. Statistical Concepts in Geography. Allen and Unwin, 1979.
警告：这些引文格式不一定是100％准确.