APA (7th ed.) Citation

Smith, L. J., & Williamson, K. (2012). Stefan's diaries: The asylum. Hodder Children's Books.

Chicago Style (17th ed.) Citation

Smith, L. J., and Kevin Williamson. Stefan's Diaries: The Asylum. London: Hodder Children's Books, 2012.

MLA (9th ed.) Citation

Smith, L. J., and Kevin Williamson. Stefan's Diaries: The Asylum. Hodder Children's Books, 2012.