APA (7th ed.) Citation

Ehlers, H. (1968). Logic by way of set theory. Holt, Rinehart and Winston.

Chicago Style (17th ed.) Citation

Ehlers, Henry. Logic by Way of Set Theory. New York: Holt, Rinehart and Winston, 1968.

MLA (9th ed.) Citation

Ehlers, Henry. Logic by Way of Set Theory. Holt, Rinehart and Winston, 1968.