APA (7th ed.) Citation

Turnbull, S., King, C., & Parker, L. (2016). Castles. Usborne Publishing Ltd.

Chicago Style (17th ed.) Citation

Turnbull, Stephanie, Colin King, and Laura Parker. Castles. London: Usborne Publishing Ltd, 2016.

MLA (9th ed.) Citation

Turnbull, Stephanie, et al. Castles. Usborne Publishing Ltd, 2016.