Keene, G. B. (1961). Abstract sets and finite ordinals: An introduction to the study of set theory. Pergamon.
Chicago Style (17th ed.) CitationKeene, Geoffrey Bourton. Abstract Sets and Finite Ordinals: An Introduction to the Study of Set Theory. Oxford: Pergamon, 1961.
MLA (9th ed.) CitationKeene, Geoffrey Bourton. Abstract Sets and Finite Ordinals: An Introduction to the Study of Set Theory. Pergamon, 1961.