Cita APA (7th ed.)
Avila, D. (1977). The helping relationship sourcebook (2nd ed.). Allyn and Bacon.
Cita Chicago (17th ed.)
Avila, Donald. The Helping Relationship Sourcebook. 2nd ed. Boston: Allyn and Bacon, 1977.
Cita MLA (9th ed.)
Avila, Donald. The Helping Relationship Sourcebook. 2nd ed. Allyn and Bacon, 1977.
Atenció: Aquestes cites poden no estar 100% correctes.