Prochaska, J. o., & Norcross, J. C. (1994). Systems of psychotherapy: A transtheoretical analysis (3rd ed.). Brooks/Cole.
Lua i Stíl Chicago (17ú heag.)Prochaska, James o., agus John C. Norcross. Systems of Psychotherapy: A Transtheoretical Analysis. 3rd ed. California: Brooks/Cole, 1994.
Lua MLA (9ú heag.)Prochaska, James o., agus John C. Norcross. Systems of Psychotherapy: A Transtheoretical Analysis. 3rd ed. Brooks/Cole, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.