APA-ийн эшлэл(7 дахь хэвлэлт)

Perras, G. R. (2003). Stepping stones to nowhere: The Aleutian Islands, Alaska, and American military strategy, 1867-1945. UBC Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Perras, Galen Roger. Stepping Stones to Nowhere: The Aleutian Islands, Alaska, and American Military Strategy, 1867-1945. Vancouver: UBC Press, 2003.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Perras, Galen Roger. Stepping Stones to Nowhere: The Aleutian Islands, Alaska, and American Military Strategy, 1867-1945. UBC Press, 2003.