21
Published 1993
22
23
24
by Parker, R.H.
Published 1984
25
26
27
28
29
30
by Sakker, Elizaberth
Published 1999
31
by Board of engineers Malaysia
Published 2002
32
33
34
Published 2001
35
Published 1990
36
by Collin, P. H.
Published 1994
37
Published 1967
38
by Greenberg, Jerrold S.
Published 1994
39
by Armstrong, C. G.
Published 2000
40
by Douglas, John F.
Published 2001