APA (7th ed.) Citation

Ryan, J., & Williams, J. (2007). Children's mathematics 4-15. Open University Press.

Chicago Style (17th ed.) Citation

Ryan, Julie, and Julian Williams. Children's Mathematics 4-15. Maidenhead, Berkshire, England: Open University Press, 2007.

MLA (9th ed.) Citation

Ryan, Julie, and Julian Williams. Children's Mathematics 4-15. Open University Press, 2007.