Weil, David N.
Pearsons Addison-Wesley, 2009
Buku Teks
Barro, Robert J.
McGraw-Hill, 1995
Buku Teks
Barro, Robert J.
MIT Press, 2003
Buku Teks
Eltis, W.A.
Hutchinson University Library , 1966
Buku Teks
Morishima, Michio
Oxford University Press, 1970
Buku Teks