Claude, R. (1960). The soul of Pier-Giorgio Frassati. Spiritual Book Association.
Dyfyniad Arddull ChicagoClaude, Robert. The Soul of Pier-Giorgio Frassati. New York: Spiritual Book Association, 1960.
Dyfyniad MLAClaude, Robert. The Soul of Pier-Giorgio Frassati. Spiritual Book Association, 1960.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.