Bormann, Ernest G.
Harper & Row, 1965
Buku Teks
O`Shaughnessy, Douglas, 1950-
Addison-Wesley, 1987
Buku Teks
Ellingsworth, Huber W.
Prentice-Hall, 1967
Buku Teks
Gamble, Teri Kwal
Random House, 1983
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Cole, Kris
Elex Media Komputindo, 1997
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