Pennington, M. B. (1987). Thomas Merton, brother monk: The quest for true freedom. Harper & Row.
Lua i Stíl Chicago (17ú heag.)Pennington, M. Basil. Thomas Merton, Brother Monk: The Quest for True Freedom. San Francisco: Harper & Row, 1987.
Lua MLA (8ú heag.)Pennington, M. Basil. Thomas Merton, Brother Monk: The Quest for True Freedom. Harper & Row, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.