APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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