APA (7th ed.) Citation

Langer, S. K. K. (1937). An introduction to symbolic logic. Mifflin.

Chicago Style (17th ed.) Citation

Langer, Susanne Katherina Knauth. An Introduction to Symbolic Logic. Boston u.a: Mifflin, 1937.

MLA (9th ed.) Citation

Langer, Susanne Katherina Knauth. An Introduction to Symbolic Logic. Mifflin, 1937.

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