MOUNTFIELD, D. (1974). A History Of Polar Exploration/ David Mountfield. The Hamlyn Publishing Group.
Lua i Stíl Chicago (17ú heag.)MOUNTFIELD, David. A History Of Polar Exploration/ David Mountfield. The Hamlyn Publishing Group, 1974.
Lua MLA (8ú heag.)MOUNTFIELD, David. A History Of Polar Exploration/ David Mountfield. The Hamlyn Publishing Group, 1974.
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