APA (7th ed.) Citation

Butterworth, N. (2011). Percy's bumpy ride. HarperCollins Children's Books.

Chicago Style (17th ed.) Citation

Butterworth, Nick. Percy's Bumpy Ride. UK: HarperCollins Children's Books, 2011.

MLA (9th ed.) Citation

Butterworth, Nick. Percy's Bumpy Ride. HarperCollins Children's Books, 2011.

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