APA (7th ed.) Citation

Watcyn-Jones, P., Johnston, O., & Farrell, M. (2002). Test your vocabulary. Penguin English.

Chicago Style (17th ed.) Citation

Watcyn-Jones, Peter, Olivia Johnston, and Mark Farrell. Test Your Vocabulary. Harlow, England: Penguin English, 2002.

MLA (8th ed.) Citation

Watcyn-Jones, Peter, et al. Test Your Vocabulary. Penguin English, 2002.