A book on the basics of von Neumann-Bernays-Gödel set theory?

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During this summer, I am taking an introductory course on "von Neumann-Bernays-Gödel set theory." My professor is really good in this subject and he doesn't use any reference book except his notes. Since I have a hard time to understand some axioms, their need in this theory, and consequences of some of those axioms; I am looking for a good book for self-study.
Free online book or a PDF would be much better.
I really appreciate any help you can provide.

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For a textbook dealing with NBG set theory, see:

Elliott Mendelson, Introduction to Mathematical Logic, CRC Press (6th ed 2015), page 231-on.