APA (7th ed.) Citation

Langer, S. K. (1953). An Introduction to symbolic logic. Dover Publications.

Chicago Style (17th ed.) Citation

Langer, Susanne K. An Introduction to Symbolic Logic. New York: Dover Publications, 1953.

MLA (9th ed.) Citation

Langer, Susanne K. An Introduction to Symbolic Logic. Dover Publications, 1953.