Abler, R. (1975). Human geography in a shrinking world. Duxbury Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAbler, Ronald. Human Geography in a Shrinking World. North Scituate, Mass: Duxbury Press, 1975.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAbler, Ronald. Human Geography in a Shrinking World. Duxbury Press, 1975.
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