Gravil, R. (2007). Existentialism. Humanities-Ebooks.
Lua i Stíl Chicago (17ú heag.)Gravil, Richard. Existentialism. Tirril [England]: Humanities-Ebooks, 2007.
Lua MLA (9ú heag.)Gravil, Richard. Existentialism. Humanities-Ebooks, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.