Hutchinson (Firm) & Ayto, J. (2003). Dictionary of difficult words. Bounty Books.
Cita Chicago (17th ed.)Hutchinson (Firm) i John Ayto. Dictionary of Difficult Words. London: Bounty Books, 2003.
Cita MLA (9th ed.)Hutchinson (Firm) i John Ayto. Dictionary of Difficult Words. Bounty Books, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.