Levine, Stuart R.
Pemimpi dalam diri sendiri
Spektrum, 1996
 Buku Teks
Sharma, Robin
The Leader who had no title : a modern fable on real success in business and in life
Free Press, 2010
 Buku Teks
White, B. Joseph
The nature of leadership: reptiles, mammals, and the challenge of becoming a great leader
American Management Association, 2007
 eBooks
Cole, Brent
How to win friends and influence people in the digital age
Simon & Schuster, 2011
 Buku Teks
Carnegie, Dale, 1888-1955
How to win friends & influence people in the digital age
Gramedia Pustaka Utama, 2019
 Buku Teks SO