Prochaska, J. O., & Norcross, J. C. (2010). Systems of psychotherapy: A transtheoretical analysis (7th, international ed.). Brooks/Cole Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Prochaska, James O., agus John C. Norcross. Systems of Psychotherapy: A Transtheoretical Analysis. 7th, international ed. Australia: Brooks/Cole Cengage Learning, 2010.
Lua MLA (9ú heag.)Prochaska, James O., agus John C. Norcross. Systems of Psychotherapy: A Transtheoretical Analysis. 7th, international ed. Brooks/Cole Cengage Learning, 2010.
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