APA (7th ed.) Citation

Treays, R., Fox, C., & Reiss, M. (1997). Understanding your muscles & bones. Usborne publishers.

Chicago Style (17th ed.) Citation

Treays, Rebecca, Christyan Fox, and Michael Reiss. Understanding Your Muscles & Bones. London: Usborne publishers, 1997.

MLA (9th ed.) Citation

Treays, Rebecca, et al. Understanding Your Muscles & Bones. Usborne publishers, 1997.