Sinek, Simon, author
Portfolio/Penguin, 2009
Buku Teks
Huber, Diane L., author
Elsevier, 2006
Buku Teks
Morrison, Ray, author
Institution of Engineering and Technology, 2006
eBooks
Bush, Tony, author
IRCiSoD, , 2006
Buku Teks
Cadwell, Charles M., author
[American Management Association, ], 2004
eBooks