Cohen, L. W., & Ehrlich, G. (1963). The structure of the real number system. Van Nostrand.
Lua i Stíl Chicago (17ú heag.)Cohen, Leon W., agus Gertrude Ehrlich. The Structure of the Real Number System. Princeton, N.J.: Van Nostrand, 1963.
Lua MLA (8ú heag.)Cohen, Leon W., agus Gertrude Ehrlich. The Structure of the Real Number System. Van Nostrand, 1963.
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