APA (7th ed.) Citation

Ayto. (1993). Hutchinson dictionary of difficult words. Helicon Pub.

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

Ayto. Hutchinson Dictionary of Difficult Words. Helicon Pub, 1993.