Cita APA (7a ed.)

Combs, A. W., Avila, D. L., & Purkey, W. W. (1974). Helping relationships: Basic concepts for the helping professions (2d ed.). Allyn and Bacon.

Cita Chicago Style (17a ed.)

Combs, Arthur Wright, Donald L. Avila, y William Watson Purkey. Helping Relationships: Basic Concepts for the Helping Professions. 2d ed. Boston: Allyn and Bacon, 1974.

Cita MLA (9a ed.)

Combs, Arthur Wright, et al. Helping Relationships: Basic Concepts for the Helping Professions. 2d ed. Allyn and Bacon, 1974.