Lua APA (7ú heag.)

Card, O. S. (1999). Characters and viewpoint. Writer's Digest Books.

Lua i Stíl Chicago (17ú heag.)

Card, Orson Scott. Characters and Viewpoint. Cincinnati: Writer's Digest Books, 1999.

Lua MLA (9ú heag.)

Card, Orson Scott. Characters and Viewpoint. Writer's Digest Books, 1999.

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