21
by Rambo, William W.
Published 1982
22
by Cascio, Wayne F.
Published 1991
23
by Carkhuff, Robert R.
Published 1989
24
Published 1968
25
26
by Berry, Donna L.
Published 1993
27
by Gilley, Jerry W.
Published 1989
28
by Zafir Mohd Makhbul.
Published 2003
29
by Juhary Haji Ali.
Published 2000
30
Published 1991
31
by Tyson, Shaun.
Published 1996
32
by Warren, Robert H.
Published 1989
33
by Chapman, Elwood N.
Published 1988
34
by Sargent, Haydn.
Published 1991
35
by McAfee, R. Bruce
Published 1982
36
by Poon, June M. L.
Published 1994
37
by Bohlander, George W.
Published 2013
38
by Zainuddin Zakaria.
Published 2006
39
by Lyons, Terry.
Published 1971
40
by Chek Mat
Published 2001