APA

Prochaska J. O., Norcross J. O., Sue M. & Graeme C. (1998). Systems of psychotherapy. Pacific Grove: Brooks - Cole Publishing Company.

Chicago

Prochaska James O, Norcross John O, Sue Morrison and Graeme Chambers. 1998. Systems of psychotherapy. Pacific Grove: Brooks - Cole Publishing Company.

Harvard

Prochaska J. O., Norcross J. O., Sue M. and Graeme C. (1998). Systems of psychotherapy. Pacific Grove: Brooks - Cole Publishing Company.

MLA

Prochaska James O, Norcross John O, Sue Morrison and Graeme Chambers. Systems of psychotherapy. Pacific Grove: Brooks - Cole Publishing Company. 1998.