Keraf, Alexander Sonny, author
Kanisus, 1993
Buku Teks
Kotter, John P., 1947-, author
Prenhallindo, 1997
Buku Teks
Rudy Badrudin
BPFE Yogyakarta, 1997
Buku Teks
Wendi Putranto
Bentang Pustaka, 2009
Buku Teks
Etzel, Michael J., author
McGraw-Hill/Irwin, 2007
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