41
Published 2001
42
Published 1973
43
Published 1995
44
Published 1995
45
Published 2001
46
Published 2011
47
by Alvares
Published 1992
48
by Dube
Published 1984
49
by Ghatak
Published 1984
50
by Dordick
Published 1993
51
52
by Max-Neef
Published 1991
53
Published 1992
54
by Corbridge
Published 1993
55
56
Published 2000
57
by Wolfe
Published 1996
58
59
60