O`Connor, Robert E.
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Buku Teks
edited by Robert E. DiClerico, Allan S. Hammock
McGraw-Hill, 1992
Buku Teks
edited by Pietro S. Nivola, David H. Rosenbloom ; with forewords by Nelson W. Polsby and Theodore J. Lowi
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Buku Teks
Irish, Marian D., author
Prentice-Hall, 1962
Buku Teks
Moore, John A.
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Buku Teks