Hill, C. E., & O'Brien, K. M. (1999). Helping skills: Facilitating exploration, insight, and action. American Psychological Association.
Citace podle Chicago (17th ed.)Hill, Clara E., a Karen M. O'Brien. Helping Skills: Facilitating Exploration, Insight, and Action. Washington, DC: American Psychological Association, 1999.
Citace podle MLA (9th ed.)Hill, Clara E., a Karen M. O'Brien. Helping Skills: Facilitating Exploration, Insight, and Action. American Psychological Association, 1999.
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