Trewartha, G. T. (1972). The Less developed realm: A geography of its population. John Wiley and Sons.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTrewartha, Glenn T. The Less Developed Realm: A Geography of Its Population. John Wiley and Sons, 1972.
एमएलए (9वां संस्करण) प्रशस्ति पत्रTrewartha, Glenn T. The Less Developed Realm: A Geography of Its Population. John Wiley and Sons, 1972.
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