61
62
by Solomon, Michael R.
Published 2004
63
by Jacques, Ian
Published 2003
64
65
by Mankiw, N. Gregory
Published 2004
66
by Lyons, Richard G.
Published 2004
67
68
by Beekman, George
Published 2005
69
70
71
72
by Cross, Nigel
Published 2000
73
74
by Vohrah, Beatrix
Published 2006
75
by Hartmann, Pamela
Published 2007
76
by Wu, C. Thomas
Published 2006
77
78
by Hartmann, Pamela
Published 2007
79
by Tan, S. T
Published 2005
80
by Daley, Bill
Published 2006