Cain, S. (1979). Gabriel Marcel: By Seymour Cain. Regnery/Gateway.
Lua i Stíl Chicago (17ú heag.)Cain, Seymour. Gabriel Marcel: By Seymour Cain. South Bend: Regnery/Gateway, 1979.
Lua MLA (8ú heag.)Cain, Seymour. Gabriel Marcel: By Seymour Cain. Regnery/Gateway, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.