APA (7th ed.) Citation

Simon, F., & Ross, T. (2011). Horrid Henry's dinosaurs. Orion Childre's Books.

Chicago Style (17th ed.) Citation

Simon, Francesca, and Tony Ross. Horrid Henry's Dinosaurs. UK: Orion Childre's Books, 2011.

MLA (9th ed.) Citation

Simon, Francesca, and Tony Ross. Horrid Henry's Dinosaurs. Orion Childre's Books, 2011.