Trewartha, G. T. (1978). More developed realm: A geography of its population. Pergamon Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTrewartha, Glenn T. More Developed Realm: A Geography of Its Population. Pergamon Press, 1978.
एमएलए (9वां संस्करण) प्रशस्ति पत्रTrewartha, Glenn T. More Developed Realm: A Geography of Its Population. Pergamon Press, 1978.
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