Baker, Kenneth R
John Wiley & Sons, 1985
Buku Teks
Maxwell, John C., author
Menuju Insan Cemerlang (MIC), 2014
Buku Teks
Midgley, Mary, author
Routledge, 2006
Buku Teks
Ridley, B.K., author
Routledge, 2001
Buku Teks
edited and with an introd. by Arnold B. Arons [and] Alfred M. Bork
Prentice-Hall, 1964
Buku Teks