Ljungqvist, Lars, author
Massachusetts The MIT Press, 2012
Buku Teks
Gapinski, James H., author
McGraw-Hill , 1982
Buku Teks
Turnovsky, Stephen J., author
MIT Press, 2000
Buku Teks
McCandless, George T., author
Prentice-Hall, 1991
Buku Teks
Ferguson, C. E., author
Duke University Press, 1964
Buku Teks