APA (7th ed.) Citation

Ness , P., & Dowd , S. (2011). A Monster Calls. Walker Books Ltd.

Chicago Style (17th ed.) Citation

Ness , Patrick, and Siobhan Dowd. A Monster Calls. London: Walker Books Ltd, 2011.

MLA (9th ed.) Citation

Ness , Patrick, and Siobhan Dowd. A Monster Calls. Walker Books Ltd, 2011.

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