APA (7th ed.) Citation

Athena (Firm), Castor, H., & Swingler, L. (2013). She-wolves: England's early queens. Acorn Media.

Chicago Style (17th ed.) Citation

Athena (Firm), Helen Castor, and Lucy Swingler. She-wolves: England's Early Queens. [United States]: Acorn Media, 2013.

MLA (8th ed.) Citation

Athena (Firm), et al. She-wolves: England's Early Queens. Acorn Media, 2013.

Warning: These citations may not always be 100% accurate.