BLYTON, E. (2014). HAPPY DAYS: HELLO MR TWIDDLE! BOUNTY BOOKS.
Lua i Stíl Chicago (17ú heag.)BLYTON, ENID. HAPPY DAYS: HELLO MR TWIDDLE! LONDON: BOUNTY BOOKS, 2014.
Lua MLA (9ú heag.)BLYTON, ENID. HAPPY DAYS: HELLO MR TWIDDLE! BOUNTY BOOKS, 2014.
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