21
22
23
24
Published: 1991
Book
25
Published: 2005
Book
26
27
Published: 1995
Book
28
29
30
31
32
33
Published: Hatfield : University of Hertfordshire Press, 1999
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34
35
36
Published: Hatfield : University of Hertfordshire Press, 2006
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37
38
39
40
Published: 1994
Book