Christie, L. (1987). Unsung heroes: How to recruit and train volunteer youth workers. Zondervan.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रChristie, Les. Unsung Heroes: How to Recruit and Train Volunteer Youth Workers. Grand Rapids: Zondervan, 1987.
एमएलए (9वां संस्करण) प्रशस्ति पत्रChristie, Les. Unsung Heroes: How to Recruit and Train Volunteer Youth Workers. Zondervan, 1987.
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