Knowles, R. (1981). Economic and Social Geography (Fourth Edition). ELSEVIER.
芝加哥风格引文Knowles, R. Economic and Social Geography (Fourth Edition). ELSEVIER, 1981.
MLA引文Knowles, R. Economic and Social Geography (Fourth Edition). ELSEVIER, 1981.
警告：这些引文格式不一定是100％准确.