Abrahan, Joe,author
Entrepreneurial DNA : the breakthrough discovery that aligns your business to your unique strengths
McGraw-Hill, 2011
 Buku Teks SO
Finell, Dorothy
The specialty shop: how to create your own unique and profitable retail business
American Management Association, 2007
 eBooks
Zichy, Shoya
Personality power: discover your unique profile-and unlock your potential for breakthrough success
[American Management Association, ], 2013
 eBooks
Bates, Suzanne
Discover your CEO brand : secrets to embracing and maximizing your unique value as a leader
McGraw-Hill, 2012
 Buku Teks SO
Fenvessy, Stanley J.
Keep your customers (and keep them happy)
Dowjones-Irwin, 1976
 Buku Teks