Dubbs, C. (2014). America's U-boats: Terror trophies of World War I. University of Nebraska Press.
Lua i Stíl Chicago (17ú heag.)Dubbs, Chris. America's U-boats: Terror Trophies of World War I. [Lincoln, Nebraska]: University of Nebraska Press, 2014.
Lua MLA (9ú heag.)Dubbs, Chris. America's U-boats: Terror Trophies of World War I. University of Nebraska Press, 2014.
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