APA (7th ed.) Citation

Rowling, J. K., Duddle, J., & Tomić, T. (2014). Harry Potter and the Half-Blood Prince. Bloomsbury.

Chicago Style (17th ed.) Citation

Rowling, J. K., Jonny Duddle, and Tomislav Tomić. Harry Potter and the Half-Blood Prince. London ; Oxford ; New York ; New Delhi ; Sydney: Bloomsbury, 2014.

MLA (9th ed.) Citation

Rowling, J. K., et al. Harry Potter and the Half-Blood Prince. Bloomsbury, 2014.