1
by Aaseng
Published 2002
2
by Dr. N. P. Sharma
Published 2005
3
by McComb
Published 1994
4
by Hobsbawm
Published 1994
5
by Freddi
Published 2006
6
by Isaacson
Published 2011
7
by McCord
Published 2012
8
by Dunmore
Published 2013
9
by Caioli
Published 2014
10
by Currie
Published 1999
11
by Berggoetz
Published 2004
12
by Faccio
Published 2012
13
by Aaseng
14
by Anderson
Published 1996
15
by Stewart
Published 2001
16
by Klinzing
Published 1996
17
by Uschan
Published 2001