Kuratowski, Casimir (1922). "Une méthode d'élimination des nombres transfinis des raisonnements mathématiques". Fundamenta Mathematicae. 3: 76–108. doi:10.4064/fm-3-1-76-108.
Zorn, Max (1935). "A remark on method in transfinite algebra". Bulletin of the American Mathematical Society. 41 (10): 667–670. doi:10.1090/S0002-9904-1935-06166-X.
Blass, Andreas (1984). "Existence of bases implies the Axiom of Choice". Axiomatic Set Theory. Contemp. Math. Contemporary Mathematics. Vol. 31. pp. 31–33. doi:10.1090/conm/031/763890. ISBN9780821850268.