Gladwell, Malcolm, 1963-
David and Goliath : underdogs, misfits, and the art of battling giants
AudioGO, 2013
 Buku Teks
Gladwell, Malcolm, 1963-
David and Goliath: underdogs, misfits, and the art of battling giants
Back Bay Books, 2015
 Buku Teks
McGinnis, Alan Loy
Menumbuhkan motivasi memupuk semangat memetik yang terbaik
Pustaka Tangga, 1991
 Buku Teks SO
Swartz, Greg
Leadership lessons: 10 keys to success in life and business
American Society for Training & Development, 2008
 eBooks
Halvorson, Heidi Grant-, 1973-
Focus: use different ways of seeing the world for success and influence
Plume Penguin Group, 2014
 Buku Teks SO