Cita APA (7th ed.)

Lewis, C. I., & Langford, C. H. (1959). Symbolic logic (2a. ed.). Dover.

Cita Chicago (17th ed.)

Lewis, Clarence Irving, i Cooper Harold Langford. Symbolic Logic. 2a. ed. Nueva York: Dover, 1959.

Cita MLA (9th ed.)

Lewis, Clarence Irving, i Cooper Harold Langford. Symbolic Logic. 2a. ed. Dover, 1959.