Grayston, D. (1985). Thomas Merton, the development of a spiritual theologian. E. Mellen Press.
Lua i Stíl Chicago (17ú heag.)Grayston, Donald. Thomas Merton, the Development of a Spiritual Theologian. New York: E. Mellen Press, 1985.
Lua MLA (8ú heag.)Grayston, Donald. Thomas Merton, the Development of a Spiritual Theologian. E. Mellen Press, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.