APA (7th ed.) Citation

Stewart, P., & Riddell, C. (2011). Muddle Earth. Macmillan Children's Books.

Chicago Style (17th ed.) Citation

Stewart, Paul, and Chris Riddell. Muddle Earth. London: Macmillan Children's Books, 2011.

MLA (9th ed.) Citation

Stewart, Paul, and Chris Riddell. Muddle Earth. Macmillan Children's Books, 2011.