1
by Mankiw, N. Gregory
Published 2004
2
3
4
by McTaggart, Douglas.
Published 1996
5
by Lipton, P.
Published 1998
6
7
by Finer, S. E., 1915-
Published 1970
8
by Sloman, John
Published 1997
9
by Begg, David
Published 1997
10
by Case, Karl E.
Published 1996
11
by Stanlake,G.F.
Published 1997
12
by Donald, Jimmy
Published 1991
13
14
by Latimer, Paul.
Published 1998
15
16
by Lipsey, Richard G.
Published 1992
17
by Sloman, John
Published 1999
18
by Harris, Richard L.
Published 1992
19
by Aldrich, Robert, 1954-
Published 1990
20
by S. Husin Ali
Published 1981