1
2
3
4
by Wilson,
Published 1998
5
by Lewis,
Published 1998
6
Published 2003
7
Published 2005
8
Published 2005
9
by Asma Abdullah
Published 1996
10
by Cravens,
Published 2006
11
by Kotler,
Published 2003
12
by Roll,
Published 2006
13
by Lashinsky,
Published 2012
14
15
16
by Lawton,
Published 2013
17
by Smallwood,
Published 2014
18
by Chandrasekaran, N.
Published 2014
19
20
by Zikmund,
Published 2003