APA

Siwek P., . (1951). The philosophy of evil. New York: Rondald.

Chicago

Siwek Paul, . 1951. The philosophy of evil. New York: Rondald.

Harvard

Siwek P., . (1951). The philosophy of evil. New York: Rondald.

MLA

Siwek Paul, . The philosophy of evil. New York: Rondald. 1951.