21
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Published 1994
22
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Published 1958
23
by Ragayah, Eusoff
Published 1997
24
by Stoessinger, John George
Published 2005
25
by Panikkar, K. M, 1896-1963
Published 1930
26
by Walker, Andrew
Published 1978
27
by Carter, Jimmy, 1924-
Published 1975
28
by Clutterbuck, Richard L.
Published 1967
29
by Micheletti, Eric
Published 2003
30
by Gallucci, Robert L.
Published 1975
31
by Gullick, J. M, 1916-
Published 1986
32
by Bowles, Chester
Published 1954
33
Published 2001
34
Published 1953
35
Published 1993
36
by Yong, C. F.
Published 1990
37
by Kapur, Ashok
Published 2006
38
by Kadian, Rajesh
Published 1993
39
by Miller, Norman N., 1933-
Published 1994
40
by Izady, Mehrdad
Published 1992