Trojanowicz, Robert C., 1941-
Prentice-Hall, 1987
Buku Teks
Trojanowicz, Robert C., 1941-
Prentice-Hall, 1992
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Kaplan, Howard B.
Sage Publications, 1984
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Arnold, William R.
Houghton Mifflin, 1983
Buku Teks
Sellin, Thorsten
Wiley Eastern Private Limited, 1970
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