1
2
by Ekelund, Robert B, 1940-
Published 1988
3
4
by Mishan, E. J, 1917-
Published 1986
5
6
by Hawken
Published 1999
7
by Harford
Published 2006
8
by Md. Zahir bin Kechot
Published 2000
9
Published 2006
10
Published 2015
11
Published 2015
12
13
Published 2010
14
Published 2014
15
by Shutt, Harry
Published 2010
16
by Roubini, Nouriel
Published 2011
17
by Charles, S. T
Published 1986
18
by Bronfenbrenner, Martin, 1914-
Published 1987
19
by Sharp, Ansel Miree, 1924-
Published 2000
20