Citazione Stile APA (7a Edizione)

Sundel, M., & Sundel, S. S. (1999). Behavior change in the human services: An introduction to principles and applications. SAGE Pub.

Citazione stile Chigago Style (17a edizione)

Sundel, Martin, e Sandra S. Sundel. Behavior Change in the Human Services: An Introduction to Principles and Applications. Thousand Oaks, Calif: SAGE Pub, 1999.

Citatione MLA (9a ed.)

Sundel, Martin, e Sandra S. Sundel. Behavior Change in the Human Services: An Introduction to Principles and Applications. SAGE Pub, 1999.