Simai, MihaÌ?ly
Pinter Publishers , 1990
Buku Teks
Naisbitt, John, author
Commonwealth, 1994
Buku Teks
Little, Ian M.D.
Basic Books , 1982
Buku Teks
R. Winantyo, author
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Buku Teks
Vernon-Wortzel, Heidi, author
John Wiley & Sons, 1997
Buku Teks