Bessels, E., & Barr, W. (2016). Polaris: The Chief Scientist's Recollections of the American North Pole Expedition, 1871-73. University of Calgary Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBessels, Emil, और William Barr. Polaris: The Chief Scientist's Recollections of the American North Pole Expedition, 1871-73. Calgary: University of Calgary Press, 2016.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBessels, Emil, और William Barr. Polaris: The Chief Scientist's Recollections of the American North Pole Expedition, 1871-73. University of Calgary Press, 2016.
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