Lua APA (7ú heag.)
Vogt, A. E. v., & Smith, G. O. Earth's Last Fortress. Ace Books.
Lua i Stíl Chicago (17ú heag.)
Vogt, Alfred E. van, agus George O. Smith. Earth's Last Fortress. Nueva York, EUA: Ace Books.
Lua MLA (9ú heag.)
Vogt, Alfred E. van, agus George O. Smith. Earth's Last Fortress. Ace Books.
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