Butlin, R. A. (1993). Historical geography: Through the gates of space and time. E. Arnold.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रButlin, R. A. Historical Geography: Through the Gates of Space and Time. London: E. Arnold, 1993.
एमएलए (9वां संस्करण) प्रशस्ति पत्रButlin, R. A. Historical Geography: Through the Gates of Space and Time. E. Arnold, 1993.
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