APA (7th ed.) Citation

Firth, G., Berry, R., & Irvine, C. (2010). Understanding intensive interaction: Contexts and concepts for professionals and families. Jessica Kingsley.

Chicago Style (17th ed.) Citation

Firth, Graham, Ruth Berry, and Cath Irvine. Understanding Intensive Interaction: Contexts and Concepts for Professionals and Families. London: Jessica Kingsley, 2010.

MLA (9th ed.) Citation

Firth, Graham, et al. Understanding Intensive Interaction: Contexts and Concepts for Professionals and Families. Jessica Kingsley, 2010.