Hedin, S. A. From Pole to Pole: A Book for Young People.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHedin, Sven Anders. From Pole to Pole: A Book for Young People.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHedin, Sven Anders. From Pole to Pole: A Book for Young People.
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