APA

Lewis C. S., . (1952). The problem of pain. London: Geoffrey Bles.

Chicago

Lewis Clive Staples, . 1952. The problem of pain. London: Geoffrey Bles.

Harvard

Lewis C. S., . (1952). The problem of pain. London: Geoffrey Bles.

MLA

Lewis Clive Staples, . The problem of pain. London: Geoffrey Bles. 1952.