Cita APA (7a ed.)

Guardini, R. (1963). The life of faith. Paulist Press [etc.].

Cita Chicago Style (17a ed.)

Guardini, Romano. The Life of Faith. New York [etc.]: Paulist Press [etc.], 1963.

Cita MLA (9a ed.)

Guardini, Romano. The Life of Faith. Paulist Press [etc.], 1963.