Vallet, R. E. (1989). Stepping stones of the steward. William B. Eerdmans Publishing.
Chicago-čujuhus (17. p.)Vallet, Ronald E. Stepping Stones of the Steward. Grand Rapids, Michigan: William B. Eerdmans Publishing, 1989.
MLA-čujuhus (9. p.)Vallet, Ronald E. Stepping Stones of the Steward. William B. Eerdmans Publishing, 1989.
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