Lewis, C. S. (1957). The screwtape letters. MacMillam company.
Lua i Stíl Chicago (17ú heag.)Lewis, C. S. The Screwtape Letters. New York: MacMillam company, 1957.
Lua MLA (9ú heag.)Lewis, C. S. The Screwtape Letters. MacMillam company, 1957.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.