APA (7th ed.) Zitazioa
Christie, L. (1987). Unsung heroes: How to recruit and train volunteer youth workers. Zondervan.
Chicago Style (17th ed.) Zitazioa
Christie, Les. Unsung Heroes: How to Recruit and Train Volunteer Youth Workers. Grand Rapids: Zondervan, 1987.
MLA (9th ed.) Zitazioa
Christie, Les. Unsung Heroes: How to Recruit and Train Volunteer Youth Workers. Zondervan, 1987.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.