Hill, C. E., & O'Brien, K. M. (1999). Helping skills: Facilitating exploration, insight, and action. American Psychological Association.
Lua i Stíl Chicago (17ú heag.)Hill, Clara E., agus Karen M. O'Brien. Helping Skills: Facilitating Exploration, Insight, and Action. Washington, DC: American Psychological Association, 1999.
Lua MLA (9ú heag.)Hill, Clara E., agus Karen M. O'Brien. Helping Skills: Facilitating Exploration, Insight, and Action. American Psychological Association, 1999.
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