Carre, Jean Jacques, author
Stanford University Press, 1975
Buku Teks
Weil, David N., author
Pearsons Addison-Wesley, 2009
Buku Teks
Barro, Robert J.
MIT Press, 2003
Buku Teks
Barro, Robert J., author
McGraw-Hill, 1995
Buku Teks
Williamson, Harold F., author
Prentice-Hall, 1951
Buku Teks