Hymans, Saul H., author
Prentice-Hall, 1967
Buku Teks
Moore, Peter G., author
Longman , 1972
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Berger, James O., author
Springer-Verlag, 1985
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Chernoff, Herman
John Wiley & Sons, 1959
Buku Teks
Melsa, James L., author
McGraw-Hill, 1978
Buku Teks