Day, Donald
D. KcKay, 1962
Buku Teks
Spinney, Caroll
Bhuana Ilmu Populer, 2003
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Sudjic, Deyan
Fourth Estate and Wordsearch, 1994
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Powell, Kenneth
Phaidon, 1999
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Rogers, Wayne, 1933-
[American Management Association, ], 2011
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