1
by Blaxter, Loraine
Published 1996
2
by Stoljar, S. J.
Published 1980
3
by Gray, Ian
Published 1988
4
by Kiem, Paul
Published 1993
5
Published 2002
6
by Bryman, Alan.
Published 2012
7
by Babbie, Earl
Published 2013
8
9
10
by Silverman, David
Published 2017