APA (7th ed.) Citation

Pratt, L., McKenna, T., & Wray, Z. (2007). Celts. Usborne Pub. Ltd.

Chicago Style (17th ed.) Citation

Pratt, Leonie, Terry McKenna, and Zoe Wray. Celts. London: Usborne Pub. Ltd, 2007.

MLA (9th ed.) Citation

Pratt, Leonie, et al. Celts. Usborne Pub. Ltd, 2007.