Cita APA (7a ed.)

Claude, R. (1960). The soul of Pier-Giorgio Frassati. Spiritual Book Association.

Cita Chicago Style (17a ed.)

Claude, Robert. The Soul of Pier-Giorgio Frassati. New York: Spiritual Book Association, 1960.

Cita MLA (8a ed.)

Claude, Robert. The Soul of Pier-Giorgio Frassati. Spiritual Book Association, 1960.