APA (7th ed.) Citation

Hubble, M. L., Duncan, B. L., & Miller, S. D. (1999). The Heart & soul of change: What works in therapy. American Psychological Association.

Chicago Style (17th ed.) Citation

Hubble, Mark L., Barry L. Duncan, and Scott D. Miller. The Heart & Soul of Change: What Works in Therapy. Washington, DC: American Psychological Association, 1999.

MLA (9th ed.) Citation

Hubble, Mark L., et al. The Heart & Soul of Change: What Works in Therapy. American Psychological Association, 1999.