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Prentice-Hall, 1999
Buku Teks
Easterbrook, Don J.
Macmillan Publishing Company, 1993
Buku Teks
Gregory, Kenneth J., author
Sage , 2010
Buku Teks
Bloom, Arthur L.
Prentice Hall of India, 1979
Buku Teks
Ahmad Andri Gribaldi, author
1995
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