Cita APA (7a ed.)

Purtill, R. L. (1985). C.S. Lewis's case for the christian faith. Harper & Row.

Cita Chicago Style (17a ed.)

Purtill, Richard L. C.S. Lewis's Case for the Christian Faith. San Francisco [etc.]: Harper & Row, 1985.

Cita MLA (9a ed.)

Purtill, Richard L. C.S. Lewis's Case for the Christian Faith. Harper & Row, 1985.