Kerley, B. (2015). With a friend by your side. National Geographic.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKerley, Barbara. With a Friend by Your Side. Washington, D.C.: National Geographic, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKerley, Barbara. With a Friend by Your Side. National Geographic, 2015.
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