Gaya APA
O., P, J. (1979).
SYSTEMS OF PSYCHOTHERAPY: A TRANSTHEORETICAL ANALYSIS .
HOMEWOOD, ILLINOIS:
The Dorsey Press.
Gaya MLA
O., Prochaska, James.
"SYSTEMS OF PSYCHOTHERAPY: A TRANSTHEORETICAL ANALYSIS".
HOMEWOOD, ILLINOIS:
The Dorsey Press,
1979.
Textbook.