APA

Pratt L., McKenna T. & Wray Z. (2007). Celts. London: Usborne.

Chicago

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

Harvard

Pratt L., McKenna T. and Wray Z. (2007). Celts. London: Usborne.

MLA

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