APA-viite (7. p.)
Posterski, D. C. (1983). Why am I afraid to tell you I'm a Christian?: Witnessing Jesus' way. InterVarsity Press.
Chicago-viite (17. p.)
Posterski, Donald C. Why Am I Afraid to Tell You I'm a Christian?: Witnessing Jesus' Way. Downers Grove, Ill.: InterVarsity Press, 1983.
MLA-viite (9. p.)
Posterski, Donald C. Why Am I Afraid to Tell You I'm a Christian?: Witnessing Jesus' Way. InterVarsity Press, 1983.
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