Packer, Arnold H., author
MIT Press, 1972
Buku Teks
Baumol, William J., author
Prentice Hall of India, 1985
Buku Teks
Torr, Christopher, author
Westview Press, 1988
Buku Teks
Sydsæter, Knut, author
Prentice-Hall, 2008
Buku Teks
Carlson, Sune, author
Kelly & Macmillan, 1956
Buku Teks