APA

Lewis C. [., . (1962). The screwtape letters screwtape proposes a toast. New York: Macmillan.

Chicago

Lewis C.S [F], . 1962. The screwtape letters screwtape proposes a toast. New York: Macmillan.

Harvard

Lewis C. [., . (1962). The screwtape letters screwtape proposes a toast. New York: Macmillan.

MLA

Lewis C.S [F], . The screwtape letters screwtape proposes a toast. New York: Macmillan. 1962.