Lee, Kyun-young, author
Jimoondang Publishing Company, 2001
Buku Teks
Larson, Gary, author
Andrews and McMeel, 1994
Buku Teks
Datin Seri Shuryani Datuk Shuaib, author
Yayasan Semporna, 2011
Buku Referensi
Sheldon, Sidney, author
Book Club Associates, 1973
Buku Teks
Muller, Max, author
[American Management Association;, ], 2012
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