Martin, W. (1975). Screwtape writes again. Vision House.
Cita Chicago (17th ed.)Martin, Walter. Screwtape Writes Again. Santa Ana: Vision House, 1975.
Cita MLA (9th ed.)Martin, Walter. Screwtape Writes Again. Vision House, 1975.
Atenció: Aquestes cites poden no estar 100% correctes.