Cardinal number/Bibliography

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Non-technical

• Russell, Bertrand (1919). Introduction to Mathematical Philosophy. George Allen and Unwin. 

Introductory

• Keith J. Devlin (1979). Fundamentals of Contemporary Set Theory. Springer-Verlag. ISBN 0-387-90441-7.  Chapter III, §§6-10.
• Paul Halmos (1960). Naive set theory. Van Nostrand Reinhold.  §§24-25.

Advanced

• Tourlakis, George (2003). Lectures on Logic and Set Theory Volume II. Cambridge University Press. ISBN 0-521-75374-0. 
• Drake, Frank (1974). Set Theory: An Introduction to Large Cardinals. Amsterdam: North-Holland. ISBN 0-444-10535-2.