New Geographical Literature and Maps. The Royal Geographical Society (with the Institute of British Geographers).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNew Geographical Literature and Maps. The Royal Geographical Society (with the Institute of British Geographers).
एमएलए (9वां संस्करण) प्रशस्ति पत्रNew Geographical Literature and Maps. The Royal Geographical Society (with the Institute of British Geographers).
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.