Preston, R. E. Transition zone structure: The three-sector hypothesis. Town Planning Review.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPreston, Richard E. "Transition Zone Structure: The Three-sector Hypothesis." Town Planning Review .
एमएलए (9वां संस्करण) प्रशस्ति पत्रPreston, Richard E. "Transition Zone Structure: The Three-sector Hypothesis." Town Planning Review, .
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