Maxwell, John C.
Menuju Insan Cemerlang (MIC), 2015
Buku Teks
Sinek, Simon
Portfolio/Penguin, 2009
Buku Teks
Cuervo, Jorge
ATD Press, 2015
Buku Teks
Harvard Bussiness School Press, 1990
Buku Teks
Fernandez, Juan Antonio
John Wiley & Sons (Asia), 2006
Buku Teks