Cita APA (7th ed.)
Lewis, C. S. (1964). Prayer: Letter to malcolm. Fontana Books.
Cita Chicago (17th ed.)
Lewis, C. S. Prayer: Letter to Malcolm. Collins: Fontana Books, 1964.
Cita MLA (9th ed.)
Lewis, C. S. Prayer: Letter to Malcolm. Fontana Books, 1964.
Atenció: Aquestes cites poden no estar 100% correctes.