APA (7th ed.) Citation

Walliams, D. (2015). Grandpa's Great Escape. HarperCollinsPublishers.

Chicago Style (17th ed.) Citation

Walliams, David. Grandpa's Great Escape. London: HarperCollinsPublishers, 2015.

MLA (9th ed.) Citation

Walliams, David. Grandpa's Great Escape. HarperCollinsPublishers, 2015.

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