APA (7th ed.) Citation

Keene, G. B. (1961). Abstract sets and finite ordinals: An introduction to the study of set theory. Pergamon Press.

Chicago Style (17th ed.) Citation

Keene, G. B. Abstract Sets and Finite Ordinals: An Introduction to the Study of Set Theory. New York: Pergamon Press, 1961.

MLA (8th ed.) Citation

Keene, G. B. Abstract Sets and Finite Ordinals: An Introduction to the Study of Set Theory. Pergamon Press, 1961.

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