APA (7th ed.) Citation

Hughes, B. (1993). The Penguin working words: An Australian guide to modern English usage. Viking.

Chicago Style (17th ed.) Citation

Hughes, Barrie. The Penguin Working Words: An Australian Guide to Modern English Usage. Ringwood, Vic.: Viking, 1993.

MLA (9th ed.) Citation

Hughes, Barrie. The Penguin Working Words: An Australian Guide to Modern English Usage. Viking, 1993.