Speck, J. (1984). Bloch, Benjamin, Fromm, Hartmann, Tillich, Guardini. Vandenhoeck & Ruprecht.
Cita Chicago (17th ed.)Speck, Josef. Bloch, Benjamin, Fromm, Hartmann, Tillich, Guardini. Göttingen: Vandenhoeck & Ruprecht, 1984.
Cita MLA (8th ed.)Speck, Josef. Bloch, Benjamin, Fromm, Hartmann, Tillich, Guardini. Vandenhoeck & Ruprecht, 1984.
Atenció: Aquestes cites poden no estar 100% correctes.