Cita APA (7a ed.)

Tillich, P., & Hummel, G. (1992). Theological writings: Theologische Schriften. Gruyter.

Cita Chicago Style (17a ed.)

Tillich, Paul, y Gert Hummel. Theological Writings: Theologische Schriften. Berlin [etc.]: Gruyter, 1992.

Cita MLA (9a ed.)

Tillich, Paul, y Gert Hummel. Theological Writings: Theologische Schriften. Gruyter, 1992.