Gravil, R. (2007). Existentialism. Humanities-Ebooks.
Cita Chicago (17th ed.)Gravil, Richard. Existentialism. Tirril [England]: Humanities-Ebooks, 2007.
Cita MLA (9th ed.)Gravil, Richard. Existentialism. Humanities-Ebooks, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.