APA (7th ed.) Citation

Zehna, P. W., & Johnson, R. L. (1962). Elements of set theory. Allyn and Bacon.

Chicago Style (17th ed.) Citation

Zehna, Peter W., and Robert L. Johnson. Elements of Set Theory. Boston: Allyn and Bacon, 1962.

MLA (9th ed.) Citation

Zehna, Peter W., and Robert L. Johnson. Elements of Set Theory. Allyn and Bacon, 1962.

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