Παραπομπή σε μορφή APA (7η εκδ.)

Hill, C. E., & O'Brien, K. M. (1999). Helping skills: Facilitating exploration, insight, and action. American Psychological Association.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Hill, Clara E., και Karen M. O'Brien. Helping Skills: Facilitating Exploration, Insight, and Action. Washington, DC: American Psychological Association, 1999.

Παραπομπή σε μορφή MLA (9th εκδ.)

Hill, Clara E., και Karen M. O'Brien. Helping Skills: Facilitating Exploration, Insight, and Action. American Psychological Association, 1999.