41
by Samsu Adabi Mamat
Published 2002
42
Published 1997
43
by Burke
Published 1987
44
Published 1972
45
Published 1922
46
47
48
49
by Ibn Khaldun, 1332-1406
Published 1985
50
Published 1980
51
52
Published 1994
53
by Bunson
Published 1991
54
55
by Khan
Published 1995
56
57
58
by Abd Wahid
Published 1993
59
by Boulding
Published 1985
60
by Hoobler
Published 1993