Becker, Norman, author
McGraw-Hill , 1980
Buku Teks
McCrea, Bridget, author
[American Management Association;, ], 2005
eBooks
Becker, Norman, author
McGraw-Hill, 2011
Buku Teks
Sudjic, Deyan, author
Mitchell Beazley, 1986
Buku Referensi
Bird, Richard M., author
Ward Lock, 1995
Buku Teks