APA (7th ed.) Citation

British Association of Psychotherapists. Clinical Service, Cooper, J., & Alfillé, H. (1998). Assessment in psychotherapy. Karnac Books.

Chicago Style (17th ed.) Citation

British Association of Psychotherapists. Clinical Service, Judy Cooper, and Helen Alfillé. Assessment in Psychotherapy. London: Karnac Books, 1998.

MLA (8th ed.) Citation

British Association of Psychotherapists. Clinical Service, et al. Assessment in Psychotherapy. Karnac Books, 1998.