Adelman, Irma, author
[publisher not identified], [date of publication not identified]
Buku Teks
Alexander-Frutschi, author
Stanford Research Institute, 1963
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