APA (7th ed.) Citation

Langer, S. K. (1967). An introduction to symbolic logic (3rd rev. ed.). Dover.

Chicago Style (17th ed.) Citation

Langer, Susanne Katherina. An Introduction to Symbolic Logic. 3rd rev. ed. New York: Dover, 1967.

MLA (9th ed.) Citation

Langer, Susanne Katherina. An Introduction to Symbolic Logic. 3rd rev. ed. Dover, 1967.