APA (7th ed.) Citation

Powell, B., Cooper, G., Hoffman, K., & Marvin, B. (2014). The circle of security intervention: Enhancing attachment in early parent-child relationships. Guilford Press.

Chicago Style (17th ed.) Citation

Powell, Bert, Glen Cooper, Kent Hoffman, and Bob Marvin. The Circle of Security Intervention: Enhancing Attachment in Early Parent-child Relationships. New York: Guilford Press, 2014.

MLA (9th ed.) Citation

Powell, Bert, et al. The Circle of Security Intervention: Enhancing Attachment in Early Parent-child Relationships. Guilford Press, 2014.