Lewis, C. S., & Lewis, W. H. (1966). Letters of C.S Lewis. ([1st American ed.].). Harcourt, Brace & World.
Lua i Stíl Chicago (17ú heag.)Lewis, C. S., agus W. H. Lewis. Letters of C.S Lewis. [1st American ed.]. New York: Harcourt, Brace & World, 1966.
Lua MLA (9ú heag.)Lewis, C. S., agus W. H. Lewis. Letters of C.S Lewis. [1st American ed.]. Harcourt, Brace & World, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.