Lua APA (7ú heag.)
Brunner, J., & Nourse, A. E. Echo in the Skull. Ace Books.
Lua i Stíl Chicago (17ú heag.)
Brunner, John, agus Alan E. Nourse. Echo in the Skull. Nueva York, EUA: Ace Books.
Lua MLA (9ú heag.)
Brunner, John, agus Alan E. Nourse. Echo in the Skull. Ace Books.
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