Cita APA (7th ed.)
Lewis,C.S. (1971). Out of the silent planet. Macmillan.
Cita Chicago (17th ed.)
Lewis,C.S. Out of the Silent Planet. Newyork: Macmillan, 1971.
Cita MLA (9th ed.)
Lewis,C.S. Out of the Silent Planet. Macmillan, 1971.
Atenció: Aquestes cites poden no estar 100% correctes.