Cita APA (7a ed.)

Langer, S. K. (1953). An introduction to symbolic logic (2nd ed. (rev.).). Dover Publications.

Cita Chicago Style (17a ed.)

Langer, Susanne Katherina. An Introduction to Symbolic Logic. 2nd ed. (rev.). New York: Dover Publications, 1953.

Cita MLA (9a ed.)

Langer, Susanne Katherina. An Introduction to Symbolic Logic. 2nd ed. (rev.). Dover Publications, 1953.