Pennington, M. B. (1987). Thomas Merton, brother monk: The quest for true freedom. Harper & Row.
Cita Chicago Style (17a ed.)Pennington, M. Basil. Thomas Merton, Brother Monk: The Quest for True Freedom. San Francisco: Harper & Row, 1987.
Cita MLA (8a ed.)Pennington, M. Basil. Thomas Merton, Brother Monk: The Quest for True Freedom. Harper & Row, 1987.
Precaución: Estas citas no son 100% exactas.