books.google.com - This is an extensively revised edition of Mr. Quine's introduction to abstract set theory and to various axiomatic systematizations of the subject. The treatment of ordinal numbers has been strengthened and much simplified, especially in the theory of transfinite recursions, by adding an axiom and reworking...http://books.google.com/books/about/SET_THEORY_AND_ITS_LOGIC_REVISED_EDITION.html?id=6WkuDCq2QuEC&q=Neumann&utm_source=gb-gplus-shareSET THEORY AND ITS LOGIC, REVISED EDITION