1
by Berns
Published 2007
2
by Cullingford
Published 1984
3
by Erikson
Published 1995
4
by Smith
Published 2003
5
by LaFreniere
Published 2000
6
7
by Gelfand
Published 1985
8
by Chiam
Published 1995
9
by Berndt
Published 1997
10
by Mohd Amin H.A. Shariff
Published 1998
11
by Chiam, Heng Keng
Published 1994
12
by Thomas, 1921-
Published 2005
13
by Berk
Published 1993
14
by Cole
Published 1993
15
by Luria
Published 1992
16
by Bigner
Published 2010
17
by Berns
Published 2010
18
by Smidt, 1943-
Published 2011
19
by Denzin
Published 2010
20
by Kasmini Kassim
Published 1993