Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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

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