Maxwell, John C., author
Menuju Insan Cemerlang (MIC), 2015
Buku Teks
Love, Alaina, author
McGraw-Hill, 2009
Buku Teks
Frisch, Michael H., author
[American Management Association, ], 2012
eBooks
Leaders Magazine,
Majalah, Jurnal, Buletin
Cuervo, Jorge, author
ATD Press, 2015
Buku Teks