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Mandar Maju, 1992
Buku Teks
Wells, William D., author
Prentice-Hall, 2000
Buku Teks
Sutherland, Max, author
PPM, 2004
Buku Teks
Sissors, Jack Z
NTC Businness Books, 1993
Buku Teks
Sadjiman Ebdi Sanyoto, author
Dimensi Press, 2006
Buku Teks