APA (7th ed.) Zitazioa
Avila, D. (1977). The helping relationship sourcebook (2nd ed.). Allyn and Bacon.
Chicago Style (17th ed.) Zitazioa
Avila, Donald. The Helping Relationship Sourcebook. 2nd ed. Boston: Allyn and Bacon, 1977.
MLA (9th ed.) Zitazioa
Avila, Donald. The Helping Relationship Sourcebook. 2nd ed. Allyn and Bacon, 1977.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.