1
2
by Lincoln, Clive A.
Published 1994
3
by Sykes, Don
Published 1993
4
5
6
7
Published 1993
8
9
by Zikmund, William G.
Published 2003
10
11
by Saunders, Mark.
Published 2003
12
by Bulmer, John
Published 2000
13
Published 2004
14
Published 2004
15
16
Published 1995
17
18
19
20