1
2
3
4
5
6
7
by Winkler,
Published 1999
8
9
by Nilson,
Published 1999
10
by Schulz,
Published 1999
11
by Kotler,
Published 2002
12
by Kotler,
Published 2004
13
by Dhar,
Published 2007
14
Published 2004
15
by Cravens,
Published 2006
16
Published 2005
17
by Kotler,
Published 2003
18
by Roll,
Published 2006
19
Published 2011
20
by Martinez,
Published 2012