APA (7th ed.) Citation

Simon, F., & Ross, T. (2002). Horrid Henry and the scary sitter. Orion Childre's Books.

Chicago Style (17th ed.) Citation

Simon, Francesca, and Tony Ross. Horrid Henry and the Scary Sitter. Great Britain: Orion Childre's Books, 2002.

MLA (9th ed.) Citation

Simon, Francesca, and Tony Ross. Horrid Henry and the Scary Sitter. Orion Childre's Books, 2002.