Perras, G. R. (2003). Stepping stones to nowhere: The Aleutian Islands, Alaska, and American military strategy, 1867-1945. UBC Press.
Lua i Stíl Chicago (17ú heag.)Perras, Galen Roger. Stepping Stones to Nowhere: The Aleutian Islands, Alaska, and American Military Strategy, 1867-1945. Vancouver: UBC Press, 2003.
Lua MLA (9ú heag.)Perras, Galen Roger. Stepping Stones to Nowhere: The Aleutian Islands, Alaska, and American Military Strategy, 1867-1945. UBC Press, 2003.
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