1
by Shafritz, Jay M.
Published 1988
2
3
Published 1998
4
Published 2007
5
by Smith
Published 1976
6
by Gillhoff
Published 1963
7
8
9
10
Published 2010
11
Published 2012
12
Published 2005
13
Published 2005
14
Published 2005
15
Published 1962
16
Published 1969
17
by Wilkinson
Published 1959
18
by Elias
19
20
by Hornby
Published 2005