Gould, R. A. ;. J. S. A. ;. P. Spatial Organization: The geographer's view of the world. Prentice-Hall., Englewood Cliffs.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGould, Ronald Abler ; John S. Adams ; Peter. Spatial Organization: The Geographer's View of the World. Prentice-Hall., Englewood Cliffs.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGould, Ronald Abler ; John S. Adams ; Peter. Spatial Organization: The Geographer's View of the World. Prentice-Hall., Englewood Cliffs.
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