Weber, Larry
John Wiley & Sons Inc., 2009
Buku Teks
Horowitz, Mannie
Elex Media Komputindo , 1997
Buku Teks
Johnson, J. Richard
John F. Rider, 1962
Buku Teks
Emmerichs, Jack
Summit PA. Tab Books, 1983
Buku Teks
Kay, Frances
Institute of South East Asia Studies, 2009
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