Alexander-Frutschi
Stanford Research Institute, 1963
Buku Teks
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
edited by Shigeto Tsuru
International Economic Association, 1978
Buku Teks