Cita APA (7th ed.)

Combs, A. W., Purkey, W. W., & Avila, D. L. (1978). Helping relationships: Basic concepts for the helping professions (2nd ed.). Allyn and Bacon.

Cita Chicago (17th ed.)

Combs, Arthur W., William W. Purkey, i Donald L. Avila. Helping Relationships: Basic Concepts for the Helping Professions. 2nd ed. Boston: Allyn and Bacon, 1978.

Cita MLA (9th ed.)

Combs, Arthur W., et al. Helping Relationships: Basic Concepts for the Helping Professions. 2nd ed. Allyn and Bacon, 1978.