1
2
3
4
5
by Whitley,Alma
Published 1997
6
by Gabriel, Vincent
Published 1989
7
8
by Block, Stanley B.
Published 2002
9
by Siropolis, Nicholas
Published 1997
10
11
by Jain, Subhash C.
Published 2000
12
13
14
by Kotler, Philip
Published 2003
15
16
by Boone, Louis E.
Published 2002
17
18
by Appleby, Robert C.
Published 1994
19
by Robbins, Stephen P.
Published 1999
20
by Robbins, Stephen P.
Published 2002