APA (7th ed.) Citation

Ayto. (1993). Hutchinson dictionary of difficult words (Rev. ed.). Helicon.

Chicago Style (17th ed.) Citation

Ayto. Hutchinson Dictionary of Difficult Words. Rev. ed. Oxford: Helicon, 1993.

MLA (9th ed.) Citation

Ayto. Hutchinson Dictionary of Difficult Words. Rev. ed. Helicon, 1993.