Combs, A. W., Purkey, W. W., & Avila, D. L. (1978). Helping relationships: Basic concepts for the helping professions (2nd ed.). Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Combs, Arthur W., William W. Purkey, agus Donald L. Avila. Helping Relationships: Basic Concepts for the Helping Professions. 2nd ed. Boston: Allyn and Bacon, 1978.
Lua MLA (9ú heag.)Combs, Arthur W., et al. Helping Relationships: Basic Concepts for the Helping Professions. 2nd ed. Allyn and Bacon, 1978.
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