Cita APA (7a ed.)

Langer, S. K. (1953). An introduction to symbolic logic (2. ed. (revised).). Dover.

Cita Chicago Style (17a ed.)

Langer, Susanne K. An Introduction to Symbolic Logic. 2. ed. (revised). New York: Dover, 1953.

Cita MLA (8a ed.)

Langer, Susanne K. An Introduction to Symbolic Logic. 2. ed. (revised). Dover, 1953.