Layman, C. S. (2007). Letters to Doubting Thomas: A case for the existence of God. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Layman, Charles S. Letters to Doubting Thomas: A Case for the Existence of God. New York: Oxford University Press, 2007.
Lua MLA (9ú heag.)Layman, Charles S. Letters to Doubting Thomas: A Case for the Existence of God. Oxford University Press, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.