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