21
by Day, George S.
Published 1986
22
23
24
by Yeshin, Tony
Published 1995
25
by Massingham, Lester
Published 1990
26
27
by Cohen, William A.
Published 1988
28
29
Published 1990
30
Published 1996
31
by Kotler, Philip
Published 2000
32
33
34
by Jobber, David,
Published 2004
35
36
37
by Baker, Michael J.
Published 1996
38
by Jain, Subhash C.
Published 2000
39
by Moutinho, Luiz
Published 1995
40