APA-ийн эшлэл(7 дахь хэвлэлт)

Christie, L. (1987). Unsung heroes: How to recruit and train volunteer youth workers. Zondervan.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Christie, Les. Unsung Heroes: How to Recruit and Train Volunteer Youth Workers. Grand Rapids: Zondervan, 1987.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Christie, Les. Unsung Heroes: How to Recruit and Train Volunteer Youth Workers. Zondervan, 1987.