1
by Horn,Sam.
Published 1991
2
by Ringer, Robert
Published 1990
3
by Covey, Stephen R.
Published 2010
4
by Mohd. Fadzillah Kamsah, Dato'
Published 2004
5
by Ashadi Zain
Published 2004
6
by Danial Zainal Abidin.
Published 2005
7
by Schuller, Robert Harold.
Published 1990
8
by Schwartz, David J.
Published 2010
9
by Emmerling, John,, 1938-.
Published 1991
10
by Covey, Stephen R.
Published 1991
11
by Covey, Stephen R.
Published 1989
12
by Covey, Stephen R.
Published 1996
13
14
by Ainon Mohd.
Published 2005