Bruce, Maurice, author
Schocken Books, 1966
Buku Teks
Baumol, William J., author
Mass. Harvard University Press, 1952
Buku Teks
Anderson, Martin, author
Hover Institution Press, 1978
Buku Teks
Westview Press, 1991
Buku Teks
Swank, Duane
Cambridge University Press, 2002
Buku Teks