ANDERSON, H. C. (1993). FAVOURITE TALES THE UGLY DUCKLING. LADYBIRD BOOKS.
Lua i Stíl Chicago (17ú heag.)ANDERSON, HANS. CHRISTIAN. FAVOURITE TALES THE UGLY DUCKLING. LONDON: LADYBIRD BOOKS, 1993.
Lua MLA (9ú heag.)ANDERSON, HANS. CHRISTIAN. FAVOURITE TALES THE UGLY DUCKLING. LADYBIRD BOOKS, 1993.
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