21
22
23
by Jain, Subhash C.
Published 2000
24
25
26
by Kotler, Philip
Published 2003
27
by Cravens, David W.
Published 2003
28
29
30
31
by McCarthy, E. Jerome
Published 1993
32
by Makens, James C.
Published 1985
33
34
35
by Hatton, Angela
Published 1996
36
37
by Shook, Dale N.
Published 1976
38
by Morse, Stephen.
Published 1996
39
Published 1998
40