Vallet, R. E. (1989). Stepping stones of the steward. William B. Eerdmans Publishing.
Lua i Stíl Chicago (17ú heag.)Vallet, Ronald E. Stepping Stones of the Steward. Grand Rapids, Michigan: William B. Eerdmans Publishing, 1989.
Lua MLA (9ú heag.)Vallet, Ronald E. Stepping Stones of the Steward. William B. Eerdmans Publishing, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.