APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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