Lua APA (7ú heag.)

Asimov, I. (2016). Foundation and empire (NA.). Harper Voyager.

Lua i Stíl Chicago (17ú heag.)

Asimov, Isaac. Foundation and Empire. NA. London: Harper Voyager, 2016.

Lua MLA (9ú heag.)

Asimov, Isaac. Foundation and Empire. NA. Harper Voyager, 2016.

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