APA (7th ed.) Citation

Langer, S. K. (1967). An introduction to symbolic logic. Dover Publications.

Chicago Style (17th ed.) Citation

Langer, Susanne K. An Introduction to Symbolic Logic. Dover Publications, 1967.

MLA (8th ed.) Citation

Langer, Susanne K. An Introduction to Symbolic Logic. Dover Publications, 1967.

Warning: These citations may not always be 100% accurate.