Gaya APA

Combs, A, W., Avila, D, L. (1985). Helping relationships : basic concepts for the helping professions . Boston: Allyn and Bacon.

Gaya MLA

Combs, Arthur, W.., Avila, Donald, L.. "Helping relationships : basic concepts for the helping professions". Boston: Allyn and Bacon, 1985. Text.