1
by Hall
Published 1990
2
3
by Friedman
Published 1992
4
5
by Parikh
Published 1991
6
by Mohd. Fadzilah Haji Kamsah
Published 2005
7
by Garibal
Published 1994
8
by Peale
Published 1992
9
10
by Buzan
Published 2001
11
by Al-Qarni
Published 2003
12
by Losier
Published 2008