Kral, T. (1989). Portraits in words. English language programs division bureau of educational and cultural affairs.
Chicago-referens (17:e uppl.)Kral, Thomas. Portraits in Words. Washington, Estados Unidos: English language programs division bureau of educational and cultural affairs, 1989.
MLA-referens (9:e uppl.)Kral, Thomas. Portraits in Words. English language programs division bureau of educational and cultural affairs, 1989.
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