APA (7th ed.) Citation

Cooper, J., Alfillé, H., & Tonnesmann, M. (2005). Assessment in psychotherapy. Karnac Books.

Chicago Style (17th ed.) Citation

Cooper, Judy, Helen Alfillé, and Margret Tonnesmann. Assessment in Psychotherapy. London: Karnac Books, 2005.

MLA (9th ed.) Citation

Cooper, Judy, et al. Assessment in Psychotherapy. Karnac Books, 2005.