APA (7th ed.) Zitazioa

Comfort, W. (1974). The theory of ultrafilters. Springer-Verlag.

Chicago Style (17th ed.) Zitazioa

Comfort, W.W. The Theory of Ultrafilters. New York: Springer-Verlag, 1974.

MLA (9th ed.) Zitazioa

Comfort, W.W. The Theory of Ultrafilters. Springer-Verlag, 1974.